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When I put my computer into sleep mode, it will wake up while I'm away from it. There's nothing near the computer that could move the mouse or accidentally press a button and I have no idea what might be causing it.

I tried checking what woke it, apparently LASTWAKE only tells me that it has been in sleep mode, not what woke it up.

enter image description here

I also couldn't find anything in my Power Options regarding Sleep that seems off. Poking around in the Event Viewer I notice the following: enter image description here

The Power-Troubleshooter event at the top notes the following:

The system has returned from a low power state.

Sleep Time: ‎2012‎-‎10‎-‎27T11:31:53.408927000Z Wake Time: ‎2012‎-‎10‎-‎27T12:25:51.887029300Z

Wake Source: Unknown

So does anyone have an idea to find out what might be causing it and how I can prevent my computer from randomly waking up?

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3  
Wake on network activity, perhaps? I've also owned more than one laptop that woke itself up for seemingly no reason at all - when the lid was closed and inside a laptop bag –  agent86 Oct 27 '12 at 21:22
    
Yup, same for me. In my case, a 3G card that kept trying to dial out. Whenever I put the laptop to sleep, I'd power off all the radios first. –  user3463 Oct 27 '12 at 21:23
    
It might be my laptop or NAS, but how can I figure out what might be causing it? –  Ivo Flipse Oct 27 '12 at 21:23
    
I'm not in front of my Win8 box at the moment, but does the event log have any details about what triggered the power state change? –  Nathan Osman Oct 27 '12 at 21:30
3  
Check out your Power Management Options on your Control Panel> Power Settings>Change plan settings>Change advanced power settings. -> “Multimedia settings” option, “When sharing media.” ->”Allow the computer to sleep. Check other options one by one while you’re at it. –  avirk Nov 2 '12 at 2:48

7 Answers 7

up vote 13 down vote accepted
+100

I've had this problem before when I had network shares that were hosted on the sleeping machine, but accessed by other machines on the network. There are some settings for network cards that determine if it can wake the machine from sleep, and under what conditions:

This TechNet article explains the power management settings for network devices on Win7. There's not a Win8 version of this page yet, but I assume they are somewhat similar.

Beyond this, many other devices with similar checkboxes to allow for waking - I'd probably advise turning as many of these off as possible, and seeing if your problem persists. If it does, you might consider a binary search style approach to figure out which one is the offending sleep-disturber.

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Given that I can still wake my computer by clicking on my mouse, even though I disabled it, I think your answer must have been what solved my problem. So enjoy the bounty :-) –  Ivo Flipse Nov 3 '12 at 11:27

If you type in your elevated command prompt powercfg /waketimers, it will display a list of scheduled tasks that will wake the computer. You might discover what could be causing this to occur.

If it is a wake timer that's causing this behavior, if you go into the Advanced power settings, under the Sleep category, you can disable Wake Timers. This might fix your issue, if this is the culprit.

For instance, I see this when executing that command: enter image description here

EDIT:

Also, by the way, I did recall this occurring with my laptop once. It took a bit of troubleshooting, but I discovered that the culprit was my Microsoft Arc Touch Mouse. I discovered that the USB dongle (which received its wireless signal), caused the computer to periodically wake up, even though the mouse wasn't powered on. I fixed the issue by finding the USB device in the Device Manager and, under Properties, turning off "Allow this device to wake this computer". However, I found a more prudent solution was to just not leave it plugged into the laptop all the time. :)

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I have this as well and "There are no active wake timers in the system." That said, it could very well be that additional wake timers are set when the system goes to sleep. –  badp Oct 27 '12 at 21:51
    
It says: There are no active wake timers in the system. –  Ivo Flipse Oct 27 '12 at 21:51
    
Re: your edit. I have an external mouse and keyboard plugged in at all times but normally those devices are unable to wake up the system anyway... I guess I'll try turning that switch off then. –  badp Oct 27 '12 at 21:55
1  
Nope, no joy. I found my computer was still awake when I woke up :( –  badp Oct 28 '12 at 7:37

I fixed this by doing the following:

  1. Go Device Manager
  2. Selecting each keyboard and mouse device and right-click Properties
  3. Go to the Power Management tab and untick "Allow this device to wake the computer".
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I like to wake up my computer with the mouse and the keyboard. However, somehow the Logitech wireless mouse woke up the laptop with a slight motion. So I disabled it, and now I stick to waking up the computer with the keyboard space button. –  olee22 Jul 19 '13 at 6:55

You should check if you have anything similar to this in your BIOS:

enter image description here

Setting everything to disabled at the "Power" tab should override any Windows settings.

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There might be a scheduled task for the night that wakes up the computer.

I would check "Schedule tasks" (or whatever it is called on Windows 8), and specifically in your case the task of Microsoft / Windows / Time Synchronization / Conditions tab / check-box "Wake the computer to run this task".

You can also disallow all wake-up timers in Power Options / Advanced settings / Sleep / Allow wake timers.

Some helpful articles (and their comments) :

How to Fix a Computer that Keeps Waking Up
How To Prevent Your Computer From Waking Up Accidentally

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I checked the Power Options, they were all turned off in my case. I also checked the Schedule tasks, but the check boxes are all ticked off. –  Ivo Flipse Oct 30 '12 at 13:04
    
Thanks for the tip, it was on the things that woke up my computer. –  olee22 Jul 19 '13 at 6:55
    
See also superuser.com/a/522628/35525 –  David d C e Freitas Sep 15 '13 at 5:35

Sometimes there are several things in parallel behind a problem, which was my case. There were several things that woke my laptop at night occasionally. I had to alter all these:

  1. LAN-card, Wifi-card: Switch off network card "Allow this device to wake the computer"
  2. Logitech wireless mouse: Switch off "Allow this device to wake the computer"
  3. Mouse/keyboard in Logitech unifying controller "Allow this device to wake the computer"
  4. Hard drive maintenance schdeuled at 03:00 AM(defragmenter)
  5. Windows Backup scheduled at 03:00 AM
  6. Windows Update scheduled at 02:00 AM
  7. Windows Time synchronisation
  8. Multimedia streaming
  9. Shared folders on the hard drive

I changed the settings in the Network Card properties, Mouse properties, Time settings, Windows Backup. I also run command prompt: powercfg /waketimers.

Then I went through all the sub folders of in Task Scheduler, and modified all remaining tasks to run during weekdays, at lunch time or at dinner time. I've also set to have an idle period of 15 minutes, and to stop if I resume using the laptop. For example windows backup slows down my hard drive access, and I don't want it to interrupt my work, and it will run next day anyway. See the two screenshots below.

Start menu\**Task Scheduler**\[tasks]\**Trigger**\**Daily At 03:00 AM every day**

Start menu\**Task Scheduler**\[tasks]\**Conditions**\**Wake* the computer to run this task**

I like to wake up my laptop with the mouse and keyboard, but then I disabled the mouse. It woke the laptop even just by shaking the table a bit, and sometime even without movement (probably due to the wireless connection of the mouse). So now, I stick to the space bar (it is a wired external keyboard).

Otherwise, I have Windows 8 Pro, on a 2013 model Sony S13 laptop, with UEFI bios.

enter image description here enter image description here enter image description here enter image description here enter image description here enter image description here

The "regular maintenance" setting can also be accessed through: Control Panel\System and Security\Action Center\Automatic Maintenance

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Wade through all the scheduled tasks in Task Scheduler and, under Conditions, make sure that "Wake the computer to run this task" is NOT set (except for those where you may actually want this action). You can also control whether the task runs on battery or not, if you have a laptop.

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