My computer seems to randomly turn itself on, usually in the middle of the night when I’m asleep. It’s in my bedroom so it wakes me up. I’m running Windows 7 and I don’t know if it’s trying to runs updates but it doesn’t seem to be doing anything once it’s on. It only seems to do it only when it’s in sleep mode rather than completely shut down.
Solution:
You need to check what wakeup mechanisms you have configured.
Any on of them will push it out of sleep.
Check Fix for Windows 7 “random wake from sleep” problem.
It refers the powercfg tool,
powercfg -lastwake
will tell you what tripped it the last time…
But, do look at the rest of that posting too.