Is It Better to Shut Down, Sleep, or Leave a Mac Turned On When Not Being Used?

Apr 10, 2012 - 83 Comments

Should a Mac go to Sleep, Shutdown, or Stay On?

When it’s not in use, do you shut down your Mac, put it to sleep, or just keep it turned on? Is one choice better than the others? Why and why not? These are great questions, so let us review the choices and why you may want to choose one over the other.

Sleeping a Mac

This is my preferred choice because it provides for the easiest and fastest way to resume work while still maintaining hardware. It’s practically instantaneous to sleep a Mac and when you wake it up all of your open apps, documents, window arrangements, and web pages, are exactly where you left off with practically no delay. For the average Mac user who wants to quickly get back to what they were doing, sleeping is perfect.

  • Pros: Quickly resume exactly where you left off; sleep and wake can be scheduled or even done remotely
  • Cons: Minor power consumption; system temp, swap, and cache files don’t get cleared out during reboot process; system updates requiring reboots don’t install automatically without a manual reboot; performance is best for Macs with 4GB RAM or more

If you use the Mac every day, simply putting it to sleep when it’s not in use or overnight is probably the best choice. Just be sure to remember to reboot every once in a while to allow system software updates to install as part of a general maintenance routine, though waiting for an OS X Update or Security Update is generally a sufficient time between reboots. You can also gather some gigantic uptimes with this approach which is pretty much a useless statistic other than the nerdy bragging rights, (I’m currently at 35 days, weeeee!) but hey it’s fun to check anyway.

Shutting the Mac Down

I basically never shut down a Mac unless it’s going into a longer term state of inactivity or storage. Shutting down a Mac is slower since all open applications and documents have to quit, and then when you turn the machine back on everything has to re-open again to get back to where you were prior to shutdown. OS X Lion made resuming past application states much simpler with the automatic window restore feature (which some dislike and choose to disable), but I still find it too slow to be usable for my instant-on demands.

  • Pros: Saves power, doesn’t strain hardware; system temp, memory, swap, and cache files get cleared out during boot; allows for major system updates to install
  • Cons: Takes a while to boot up and resume previous activity, no geeky uptime bragging rights

For the power conscious or for those trying to squeeze the absolute longest lifespan out of hardware and hard disks, shutting down when not in use is the best choice. This is also what you’ll want to do if you’re going to put a Mac in longterm storage, won’t be using it for a longer than a few days, or if you’re going to be traveling with a Mac that isn’t in use during the travel period.

Keeping a Mac Always Turned On

Leaving a Mac constantly turned on is another viable option, though I think it’s best reserved for Macs that function as servers. This approach also carries the most polar advantages and disadvantages. On the plus side, you don’t have to bother resuming anything since it’s already on, you can schedule all maintenance and backup tasks to occur in the wee hours of system inactivity, and it allows for something like a constantly available SSH server or media center to be running on the machine. The downsides are basically the constant power consumption and the constantly active hardware, which can limit overall lifespans of the computer components.

  • Pros: No waiting for use; instantly resume all apps and tasks exactly where you left off; allows for servers to run with constant accessibility; backup and system maintenance tasks can be scheduled for off hours
  • Cons: Constant power consumption; more wear and tear on hard drives, fans, and physical hardware due to possible heat

If you’re running a server or media center, leaving a Mac turned on constantly is a no brainer. For the casual Mac user, it’s probably best to put a Mac to sleep when it’s not in use though, it gives hard drives and fans a rest, and will generally lead to a longer lifespan of the computer.

What do you do and why? Let us know your thoughts and habits in the comments.

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Posted by: Paul Horowitz in Mac OS X, Tips & Tricks

83 Comments

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  1. Geekfori says:

    I am a shut er down type guy, BUT only because of the SSD I put into my MacBook Pro.

    My wife shuts the lid so it goes into sleep, hate that!

    • crypto7 says:

      I am surprised nobody has mentioned cron… there are a 1 day, 1 week and 1 month, I think? Does everyone trigger the one month with Onyx or [catname] Cache Cleaner, etc.? If not I am under the impression that the 1 month will *never* run if it is not on w/out reboot or shutdown for at least 30 days. That being said I would be ALWAYS ON regardless due to Folding@Home (http://folding.stanford.edu)

  2. Blake says:

    I do a little of the first two.

    During the day I put it to my screensaver when I’m not using it, which then goes to sleep in about 15 mins. I find a hot corner very helpful for this.

    Then at night I shut it down, because my room is already hot enough at night without a computer running…

  3. Eddie B says:

    My Mac Pro at work, I have is scheduled to sleep after the work day, on weekdays then have it wake up right before I get into the office. While it is sleeping, I use wake-on-LAN via LogMeIn to wake it up and then it goes back to sleep after I log out. I do this because sometimes when I leave work, I need to get files in one of the hard drives inside. Although there have been times I needed to get into it on the weekend and I was basically screwed because it was completely off.

  4. Lonnie Denison says:

    I would like to point something out about your posting today with regards to shutdown, sleep, or leaving a mac running. In my experience as a systems administrator over the past 15 years, and with having to regularly service and maintain thousands of machines, I have made and discussed with others the following observations. While your logic for complete shutdown and sleep is valid, I must disagree about the pros and cons section of the leaving the system on. First, one of the most intense uses of a hard drive is the powering on and off. Most hard drive failures occur not from consistent usage, but from excessive power cycles or reboots. When you sleep the system, you also stop the drive from spinning. Mechanically, this will shorten the life of the drive more than having it powered on and spinning constantly. This one reason more than any other is the main reason I leave my system powered on. Next, with regards to heat and other component usage – the best thing for this is actually simply sleeping the display. This is especially true for the iMac, since the heat of the display is so closely intertwined with the rest of the components. Since the headline photo attached to this story is an iMac, I think it’s worth noting. I believe a solid case can be made that if you use your Mac on a daily basis, you can achieve better longevity from leaving the system powered on and the display asleep when not in use. Sleep the system if gone for say, a weekend. Power the system off if gone for a long term. The main things you have to worry about failing in a computer are the mechanical items… the moving parts. Hard drive first, Fans next, and then anything that relies on the fans for cooling. If you keep the drive spinning, and you keep dust and other particulates out of the air intakes – you can achieve the best overall longevity from having the system stay energized and reduce the number of startups, either hard (from shutdown) or soft (from sleep). I also readily admit that I don’t care at all about how much energy my system uses since when I’m not at the keyboard driving it, the cost and energy usage is pretty trivial. Though for the hard core energy conscious, sleeping may be the best idea. It just depends on what you may be running on your system that you want to keep available for service, or how environmentally conscious you wish to be. Anyway, thanks for discussing this topic. :)

    • Bill says:

      I have to say I agree with you pretty much 100%. Having worked on and used computers over a span of over 40 years my experiences are in line with yours. One point you failed to make clear is that a leading cause of metal fatigue is the continual shrinking and expanding that occurs when these mechanical devices heat up and cool down. My experiences are that running things at as constant a temperature as possible is a good idea.

      Anyway, I do the same as you do. I allow my system to run 24×7 unless I am going to be gone for a couple of days and using a hot corner to sleep the display.

    • Kr00 says:

      I agree with leaving an iMac on constantly. A computer engineer told me some years ago, that the quickest way to shorten your computers life, was to turn it on and off every day. He said the constant heating and cooling of all the components by doing this, will lead to hardware failure 10 times faster than having it at a constant temperature. Needless to say, I have a 10 year old iMac (swivel screen) that hasn’t stopped from day one, and not one hardware change.

      • ben says:

        your an idiot, Your mac is not an industrial computer that goes through high temp change. It is always good to turn off your computer if your not using it for a long period of time. Especially if your computer is connected to the internet constantly you might want to shut it down. People please use common sense.

        • Justin says:

          It’s not the Macro components, it’s the little components, especially capacitors, and IC’s. The heating and cooling of these stresses them like anything made from metal. This isn’t even something that is a revelation – I’ve heard many an engineer from companies (Epson, HP, Canon), all refer to this issue. Would I leave my machine on? No, I use standby to save energy, but anyone with commence knows that heating and cooling is what wears an electronic device out.

        • larry says:

          How freaking rude and condescending, Ben w/your “Your an idiot.” in an otherwise friendly blog. Yuk!

    • Chazz Adler says:

      I agree with everything said. I also believe even with the advances in chip and circuit board technology the biggest stress on these “Non-moving” components come from power surges during the process of bringing a system up. So I think turning your system on a minimum of 365 times a year is not advised, power consumption issues aside.

    • Blake says:

      After reading this, I am never turning my computer off again. I will use display sleep from now on.

    • I’ve also been a sysadmin for 10+ years and most of the machines I managed were server class systems. “Any sort of change or update isn’t tested until the system reboots to a known state” was one of the rules we used in my last contract. Those big systems didn’t have a ‘hibernate’ state like MacOS systems, so there was no sleep. I reboot periodically because I’ve watched my swapfiles grow to 2GB sometimes. Performance gets laggy and rebooting cleans that up. Also, in Safari and Numbers I’ve noticed that keyboard input stops responding sometimes in 10.6.8 and restarting those apps fixes the problem. So I tend to reboot and keep my system up and running all the time like it was a server. It runs Boinc and SETI@home when not in use, so I don’t feel like I’m wasting cycles. It never occured to me that reboots would fatigue a disk and shorten it’s life. Since most of the systems I managed were supposed to be up 24x7x365 unless a hardware/software change was needed, I never thought about that.

    • Michael Smith says:

      My Comment Exactly but better :-)

      During the course of over 20 years, Many of my Many Macs (including mini) and others drives’ died in their sleep
      RIP STUFF

      and Ironically I rarely ever used sleep, when I decided to and thinking this is cool, one day it won’t wake up. (same cycle multiple times) You change system drives and your original drive is just frozen in a coma.

      Leave on – shut down twice a month (just because).

  5. Rico says:

    I always sleep unless I have to do a system task that will take some time like virus scan, in that case I put the display to sleep. I also sleep the display when it’s just quick breaks.

  6. Rick says:

    I use sleep exclusively and see no reason to shut down anymore. Think of the iPad and iPhone, they only reboot for system software and they never shut down. A Mac is becoming not so different. The hard drive wear/tear argument is irrelevant for those of us with SSD too.

    I currently have an uptime of 87 days, I think my last reboot was for OS X 10.7.3.

  7. David says:

    Shutting down and booting up again is still a miracle cure for some of the quirkier problems that occur on computers.

    I say sleep but *reboot at least twice a week* to maintain optimal performance.

  8. Laptop users with SSDs should shut down instead of shutting the lid. You write the swap file to the SSD every time you go to sleep, even if you don’t get to 0% battery and shut down. It won’t write all 4G (or 8G, or whatever), but that’s still a lot of memory getting written to the swapfile every time. If I shut the lid 4 or 5 times a day I am generating more writes than I’ll do the rest of the day.

    The goal with SSDs is to minimize writes. With fast startup, startup isn’t that much slower than waking from sleep.

    If you’re running FileVault 2 (or otherwise dealing with sensitive, encrypted data), then you also need to shut down. Your system could be vulnerable to a FireWire or ThunderBolt DMA attack waking up from sleep mode. A clean boot eliminates that risk.

  9. Peter says:

    If you have a SSD, just turn of “safe sleep” (Google for instructions). Then the RAM contents aren’t written to it when you close the lid.

  10. telephoner says:

    I am the only one who just reduce brightness to 0 or close the lid with Sleepless? :P

  11. jshell says:

    Sleep here with the occasional reboot, about once a week.

  12. Tamas says:

    I let my MacMini (mid 2011) to sleep. I restart it once a week.

  13. Munas says:

    I put all my Macs to sleep. With Macbook Pro it is easy, just close a lid. However, my Mac Pro refuses to sleep on schedule (15 min of inactivity) and I have to force it to sleep manually by pressing Alt+Cmd+Eject. It is not a big deal, but anyway I would prefer just leave it knowing that it will go to sleep after some minutes.
    Even if my Mac Pro has SSD as startup disk I prefer sleep to shutdown, because even with relatively fast boot it wakes up faster and I reboot or shutdown my Macs only if it is absolutely necessary.

  14. Paul says:

    On my previous iMac I *always* used sleep instead of shutdown whenever possible. Then guess what? After 3 1/2 years it NO LONGER WENT TO SLEEP. It crashed every time I tried to sleep it. Short of getting a new motherboard, Apple offered no fix. So instead I just used a screensaver for inactivity, set sleep to “Never”, and that worked fine until I replaced the iMac.

    On my current (late 09) iMac, I sleep it during the day between periods of use, and shut down at the end of the day. Plus I put a dust cover over it at night. So I do believe that it is possible to overuse “Sleep” and I do NOT recommend it.

  15. I always leave my main MBP on & just use the lid close mode on my other.. no problems and is convenient.

  16. Bill says:

    I agree with Lonnie Denison on this one. I have been in the electronics field for 43 years now and have maintained numerous types of computer systems over the years. I do NOT power my (currently) 5 different computers down unless I have to. While I do not have any system yet with a SSD drive, I have only experienced 2 drive failures in the past 8 years. Of those two drive failures, they have all failed after a power cycle.

    For those of you in thunderstorm prone areas, get a GOOD UPS.

    • DG says:

      I can see how your failures might occur after a power failure but thats not necessarily due to the fact that you’ve powered it up and down regularly perse.
      I’m in the UPS business and with some of our more important customers they are stupid/paranoid enough to avoid shutting down the unit. On those units that have hardware, (fans and contactors), failure usually occurs because of under exercise.
      Contactor stick momentarily and the fans excessively wear the bearing race in one area only and when they cool and restart, well they don’t.

  17. Dekard says:

    I have to shut down, if I use sleep if my HD goes to sleep my Thunderbolt display doesn’t come back up..

    arrgghhh….

  18. Bukowski says:

    I leave mine on all the time, it’s a laptop so I keep it raised up on a stand to add more airflow. Never had a problem, drive failure, or anything. Keep backups of course though!

  19. Robert says:

    I leave mine on over the weekend when I’m home, otherwise I turn it off to save power but also to allow FileVault 2 to work at its best. If it’s off, the disk is fully encrypted, and unless someone can guess your key (or have the resources of the FBI or NSA), your data is safe. This is not the case if it’s asleep or on.

  20. Ben says:

    I tend to turn

  21. Paulo Góis says:

    Very well written article. Liked the well thought structure. I tend to let my Macbook go to sleep automatically.

    Thank you.

  22. Robert says:

    Have a dumb question: if your laptop is on/sleep, I assume you have it connected to the power grid?

  23. Ben says:

    I’ll try that again! I generally turn off my computers over over night or when I finish using them. I even turn off at the power point to eliminate residual usage and standby powers usage of the other devices connect to the same powerboard. Since our computers can be off for days at a time and I never get up in the middle of the night to use the computer, this option makes sense for us. I don’t find the startup time an inconvenience as if I know I need to use the computer I’ll turn it on and do other things. My iMac only take around 40s to startup.

    Just a question to those with extensive electronic experience. Has the reliability of modern HDD improved substantially compared to HDD of 10 years ago? Are they now designed with this start/stop in mind? So although 10 years ago it may have been better to leave HDD spinning for longer, now, turning you computer on and off daily or allowing it to sleep does not significantly increase your risk of HDD failure? (there maybe an increased risk, but not significant)

  24. Kaush says:

    While the points presented for sleeping are strong, just a [word of caution](http://hivelogic.com/articles/macbook-battery-is-toast-after-being-fully-drained/).

    If you’re battery gets “fully” drained (there’s a difference between just 0% and fully drained), when in sleep mode, I’ve heard scary stories.

  25. Jerry says:

    I have a MacMini (2011) as my main workstation. I leave it running 24/7 per the comments stated here regard excessive shutdown and startup. I have heard through others as well, knowledgeable about computers and heard elsewhere that excessive shutting down and starting up is not healthy for the hard disks.

    Another reason is because I have almost 15TB attached externally to the macmini, primary and backup drives. I would necessarily need to unmount those and remount them every time I wanted to shutdown. Also, I do scheduled nightly backups around 02:00 and 03:00 a.m. while I sleep. Those would not be accomplished if I shutdown.

    My 27″ screen attached to the macmini is set to screen save after 5 minutes and to sleep after 15 minutes and works just fine. Makes no sense to keep the screen on if not in front of the computer.

    The Macbook Air I keep closed lid (sleep mode) unless of course I am using then. Then, the same screen saver/sleep policy applies as stated above.

  26. sparky says:

    This is my 2nd 15 inch MacBook Pro (unibody). The first one was a 2006 model, it lasted me 5 years. The current one was bought mid-2010. Prior to the MacBook Pros, I used a 12 inch G4 MacBook, it lasted me 4 years.

    I have only occasionally shutdown my Macbooks when I had to fly overseas. I have restarted them due of updates.

    I have learnt that not shutting Macbooks down and starting them up again when you want to use them accounts for my Macbook’s 4-5 year lifespan.

  27. Marcos says:

    Please do more than only blah, blah, blah to save de Planet. Don’t blame Brazil to destroy your habitat ( only!! ). SHUT DOWN YOUR MAC WHEN NOT USING IT! Do more than just talk!

  28. Wally says:

    If your Mac has been attacked by a virus or trojan, and that code is attempting to take over but has not yet done so, shutting it down will halt those efforts.

    Therefore always shut down.

  29. noibs says:

    With SSDs there is simply no downside to shutting down a Mac–at least at the end of each day. It takes about 15 seconds to boot my 2011 MacBook Air.

    And, like you said, rebooting resets caches makes available the maximum amount of RAM.

    Finally, during the day, I let my MacBook Air sleep–but I’ve used terminal commands so that it’s the old kind of sleep where nothing is written to the SSD and the contents are preserved in RAM. I hate the idea of the computer writing 4GB to the SSD the way it does during the default sleep mode.

    • kelly says:

      You are still burning the circuits of your Logic board & SSD with the power surge of starting up and shutting down cycle.

  30. Karen E says:

    I’m a bit surprised that the article doesn’t even mention System Preferences/Energy Saver – the options there are quite useful.

    I leave the Mac on 24/7 and sleep it, and hard drives after 30 minutes of inactivity, with Energy Saver Preferences.

    It’s also a Media Center – so I turn ON – “Wake For Network Access” – so if I want to access Live TV, Movies, or other Media – from an iPad, phone, media player or other device – it’s always there.

  31. Makka says:

    I’ve used the power button on my MacBook Pro only once. When I bought my MacBook in 2009 I used that button to initiate its first boot and from then on I’ve never used it. When I’m done, I just close the lid or I just leave it so it goes to sleep after 15 minutes. I only reboot when it tells me it wants to reboot because of a software update. Otherwise I never reboot. I even don’t turn it off while traveling by airplane.

  32. Boise Ed says:

    I have some AppleScripts that run in the morning, shortly before I get up, so that things I want to see then are waiting for me. These don’t work if the Mac is asleep, so I keep it on.

  33. Mike G says:

    I reboot about once a week to reclaim memory. After a long Adobe Lightroom session today with frequent jumps out to Photoshop and Color Efex Pro, I was still using 6GB of main memory after closing all apps. That’s time to reboot.

  34. Greg says:

    One thing that was missed here is invoking HIBERNATE mode on the mac. To do this go to Terminal.

    To ENGAGE type:
    sudo pmset -a hibernatemode 25

    To DISENGAGE:
    sudo pmset -a hibernatemode 3

    I use it and it’s great. I can go all weekend and not use my MBP and on Monday have 90% battery still left. Boot up is not as fast as sleep but faster than booting cold.

  35. Dan says:

    I put it to sleep. My girlfriend shuts it down. It ends up working out, because it should be powered down every once in a while anyway, and I don’t have to worry about doing it myself. haha!

  36. Paul Drew says:

    I power it off. I’ve heard of too many house fires caused by over heating computers. I’d rather it turned off completely while I’m in bed asleep. A bit paranoid, I know, but hey!

  37. Josh says:

    Glad I came across this page… I’m a new MBP owner and was confused about the whole sleep scenario. Would you power users recommend leaving the AC connected while sleeping? or unplug it….

  38. Anthony says:

    2 things- Sometimes my iMac -still running on the original Intel Core Duo- will start getting a little slow after a week or two of running (with sleeping), so I will shut it down and it runs much better the next time I turn it on. But from the posts/ article, it looks like I should just restart it instead? Clearing the cache is mentioned; could that be an issue, and if so is restart/shut down the only way to clear it?

    My other question is, does anyone have any kind of info on how much power it takes to wake a Mac? What is the threshold where it uses less power to just leave it for a while as opposed to sleeping it? 15 minutes, 30, an hour?

  39. kenstee says:

    I turn it off completely it when I’m going to sleep or not going to be using for more than a few hours. Like to give the components a chance to cool and “rest.” In addition, why use electricity unnecessarily. I also like it to fresh reboot from a full “off” position everyday to clear memory, etc. I have it set to boot up automatically just before I get to the office every day. So, when I sit down all is running, mail retrieved, etc.

  40. Neil Fiertel says:

    I have assorted machine..several Mac pros,a lapto, an iMac. I use some daily and others moe sporadically. I can appreciate those that sleep their machines. I on the hand have hard rives that are still for a few years and start right up which for one thing is the result of using magnetic bearings. I have eleven drives running concurrently and though some sleep, some do not and thus I I think shutting down the motherboard is a good thing. I have had two drives fail since .1994. I always shut the entire system at least every night. The two drives were elderly with bearings tat were not of the mag elevated type. This stat is based on a population f 40 drives. Keep it or shut it own, life is. Too short to worry either way.

  41. AlexSM says:

    +1 for the Hibernate alternative, but instead of using command line as Greg pointed out above, I use the “Deep Sleep” Dashboard widget, on a black Macbook with SSD drive.

  42. photoTristan says:

    Computers are supposed to work for us, not the other way around. Don’t cater to what you think is best for the computer, do whatever you want to do and what works best for you.

    If sleeping it is more convenient and saves more energy than leaving it on all the time (it does), then you should do that and not worry.

    By the time a hard drive fails or whatever, the money in electricity bills savings you would have accumulated versus having left a computer on constantly, will have more than made up for the cost of a new hard drive or even a new computer.

    • R. Birdman says:

      This is by far the best answer out of all of these in my opinion.

    • Michael Smith says:

      Once you loose all your stuff (Murphy is clever:-)….
      Good luck
      power switch = russian roulette 12 chambers 1 bullet
      sleep = russian roulette 6 chambers 2 bullets

      Either Way you may never loose.
      Experience beats logic many times and loosing drives during power cycles is one “Murphy’s” favorite gut wrenching tools
      They usually don’t stop running when they are left on.
      (if I just had not put it to sleep) Drives go into comas.

  43. Aalaap Ghag says:

    I frequently have running downloads, so I just leave my iMac on all the time. If the downloads are stopped or completed, the iMac sleeps after a while. If not, it continues downloading. I don’t have to do anything. It just works!

    However, I let the MacBook sleep by closing the lid because I never have any downloads running on it.

  44. GeoffreyG says:

    Thank you all for sharing your tips.

    I wanted to know one more thing. I have a laptop (MBP late 2011).

    I know that during the beginning of OS X, when sleeping the computer, the HD heads were not parked, so if the laptop was moved too vigorously, the heads would damage the HD disk.
    So, when moving my computer (going to school / work, flying…), I always shut it down.

    What about now ? Can I carry my laptop in my backpack without shutting it up, just sleeping it ?

    Thank again ! GG

  45. [...] mind the possibility of a shorter drive life for both the internal and external hard drives. If you leave your computer turned on all the time rather than sleeping or shutting down, this is probably not the best option to [...]

  46. Venster says:

    I thought this article was going to address balancing thermal stress vs. corrosion.

    If you leave any micro-electronic device turned off for an extended period of time, corrosion will erode the tiny circuits and switches. If you leave it on, the heat generated by the circuits will prevent moisture from corroding the parts.

    On the other hand, turning it off and on all the time may introduce thermal stresses or even current spikes that can eventually break one or more of the millions of microscopic connections inside the chips, display array, and hard drive.

    So in a humid environment, it might be best to leave the computer ON all of the time to prevent corrosion, in a very dry environment, it might be best to turn it off when not in use to save power.

    Bottom line: If you are not in one of these extreme environments, the question of ON/OFF/SLEEP is not really an issue. Sleep it when you are not going to use it for more than an hour, and just reboot when things stop working right.

  47. Peter, Oslo says:

    I sleep my Macs. I have an PM iMac G4 that I move twice a year to/from my summer “house”, that sleeeps when I don’t use it. It is stil doing fine. I have a PB G4 that also sleeps when not in use (usually because I shut the lid). The PB still lives, despite numerous falls. One fall cost me a new HD and loss iof some data, I couldn’t FireWire TargetMode it because it would get stuck on some corrupted files (it booted, but no apps except Finder would run…). So I got all the salvageable stuff over to an external HD & turned it over for a HD replacement. Bottom line? A laptop leads a hard life, the power cycles are not what will kill it. A desktop Mac? If it’s in the same room as you sleep, sleep it, unless you sleep well to humming fans & HDs. Otherwise? I feel bettter sleeping it than having it on when I’m not home, in case something should go wrong. The same goes for TVs and other things: Better turn them all the way off or pull plug from wall, thermostats do fail.
    Thus, I subscribe to the “sleep” faction. I do not worry about the stressing thing, I have a G3 still kicking (as well as a PM6500 w/PowerPC processor upgrade…). On an antique Mac, perhaps, yes, but newer Macs? No.

  48. Rick says:

    Keep it off. Hackers can remotely turn your PC on when you are asleep and do all sorts of nasty things to you.

  49. Jake says:

    Well,
    My Core2Duo Black Macbook, I tend to sleep most of the time. It has a regular HDD. I may just leave it on and play music from it to my sound system during the day when I am not home for the cat,

    I shut down when I notice I have started a big Ram Disk swap. Right now I only have 200MB of disk swap. I run my laptop with 4 gigs of ram. So its rare it builds up to two gigs.
    I may also shut down if I take the computer some wheres and its going to be a long walk. Like to the cyber cafe.

    It also gets turned off on hot hot days where I am, I had it off for a few hours yesterday because it was like 40+ and I know the computer likes to over heat if its to hot out. Plus it seems to warm up my small apartment

    If im out I will sleep alot of the time, if im at home I might sleep once in a while or always at night, unless I have torrents going, Then its on 24-7.

    My PC Crap-tower p4 I tend to leave off most the time and only use it for extra storage as it has a portable usb drive I can not use on my mac because of the USB is not high powered.

  50. Sandman619 says:

    OS X has had the ability to handle CRON tasks either while the computer is in use. or will schedule them as soon as possible if the computer has missed its schedule. Used Macaroni for this until OS X made that app panel redundant

    Strictly speaking for the OS, the Unix core of OS X is designed to run servers, with max uptime & minimal rebooting. This is why most software updates don’t require a system reboot

    Apple has designed OS X to intelligently determine when to spin down hard drives, tough the user can select their preferred time to optimize their workload. Beyond that, OS X will, in stages, turn off displays, including external, then enter sleep modes. Overtime, the OS will save its active RAM contents to the hard drive or flash drive as the case may be

    Unless specific needs warrant, the computer is capable of taking care of itself

    Cheers !

  51. Willowgill says:

    I’ve read all these comments with interest. I’m running an iMac which I tend to just sleep each night unless I’m going out somewhere as I’m concerned about security (something no one has addressed – if it’s switched off it needs a password to reboot otherwise it just wakes up to whatever was open before). I have had to turn it off by the button a couple of times when it seems to have crashed and won’t respond but for the majority of time I sleep it. It seems to get very hot though if i leave it on so worries me it may cause a fire overnight. We have 2 ipads and an iphone all of which are on permanently so the ‘leave on’ option seems to make sense. Can anyone comment on leaving a Windows based pc on permanently too – I also run a Dell Vostro 360 which is very similar to the imac in that it’s all built into the large 23″ screen. I turn this off every night – would it be better to sleep this too?

  52. Enrico says:

    I am an ACMT with 2 Macs.

    My home Mac (once a G5, then a Mac Pro, more recently an Intel Mac Mini) is always on. I use my MBP with a combination of sleep and shut down.

    Apple suggests NOT to shut down your Mac if you plan to use it in the next 6 hours. So, if you do, just put it to sleep.

    For sleep users: it is better to shut down your Mac once in a while; better still clean caches, repair permissions, reboot and empty the trashcan.

  53. Oscar says:

    I might be causing some minor environmental damage here, if anyone listens, but I’ve heard somewhere that sudden temperature changes causes defects in the materials, and that this leads to more wear, than keeping the computer on.

    So turning your computer on and off will actually shorten the lifespan of the components.

  54. I normally turn off my G5 when I don’t use it.
    It’s power cunsumption is far too high to let it on constantly.

    For short intervals I put it to sleep. Power consumption is still kinda high but it allows me to continue work where I left off.

    And because of the SSD boot up takes less than a minute (which I can wait).

  55. Krull says:

    This is an interesting little topic. I’ll add my 2 cents to keep this comments section alive: I’ve had an iMac for a year now and I quickly learned that sleeping it was just annoying and made no sense, since it disconnected from the network and interrupted stuff like torrent downloads (all legal stuff, I promise). I’d rather keep the drives spinning and the connection active, so I put the Sleep slider to “Never” and I just sleep the display when I step away. I use it every day. On the rare occasion when I leave for a weekend or 5 days or whatever, I just leave it running with the display asleep, same as if I were in the house. I’ve never had any issues with this machine. Time will tell, of course, but so far so good. FWIW, I’ve been known to maintain a lean mean machine in the past: all my PCs and Macs have lasted well beyond their normal shelf life with plenty of fight left in ‘em.

  56. Kelvin says:

    Good to know. I guess I will be putting my Air to “Sleep” more than shutting down now.

  57. Anthony says:

    I’ve just been on the phone with tech support over a fan noise issue that just started about of month ago after a year and a half of silent performance. The tech rep told me that being in sleep mode for extended periods of time was bad. By “extended” I told her that basically I sleep it over night, while I’m at work, etc. She didn’t specify whether the heating/cooling cycles and such were the culprit. I thought this was odd, but she was hinting that coming out of sleep mode might be wearing down the fan. There doesn’t seem to be a whole lot of other explanation for it. But, I have to admit it does quiet down a bit once it’s been running for a while.

  58. yewenyi says:

    I put the mac to sleep mostly. But I am worried. We suffer frequent blackouts where we are. So Hibernate would be better. Now reading the comments above I have an idea as to how to hibernate it. :-)

  59. Cerebro says:

    I affiliate myself with the “sleep” camp. I have a mid-2010 MacBook Pro. I’ll put it to sleep every night before bed and every morning before I leave for work. Otherwise, I let it put itself to sleep when not in use. I only shut it down when I have to pack it up to travel somewhere or when I do system updates.

  60. Michael Smith says:

    My Bottom line on Sleep
    After several Nightmares, One becomes paranoid of sleep.

  61. [...] of power options, including sleep, restart, and shut down. While most home users will want to keep those options available, there are many instances where hiding the power buttons is desired to prevent the Mac [...]

  62. patrick says:

    Does all these comments applies for a macbook pro, where you have to move it from a place to another in the car for example ?!

  63. Turd Ferguson says:

    I take my imac to bed with me every night too keep the metal parts from getting too kold. not good pillow though

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