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I am turning my Windows 8 box into hibernate for night. But at morning I am finding it wake up. I know I can use trial and error method to find what is turning it on. But is there any registry, which remembers wake up signal, which woke up a computer this time?

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You can open a command prompt and run powercfg -lastwake.

You can do this in a batch file like this:

lastwake.bat (put it on your desktop for easy access)

powercfg -lastwake
pause

At the Wake Source it should state your wake-up source.

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  • I didn't know you about this command. I just tried it out and it works well. For anyone who gets Wake History Count - 0 as the output of this command, it's because your computer hasn't woken up from sleep yet (e.g. reboot, powered up after a shutdown, etc.)
    – Vinayak
    Jun 7, 2014 at 12:23

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