sleepwindows 7
Every night I put my Windows 7 machine into sleep mode, and every morning I wake up and the thing is running.
How I can find out which process is waking the thing up?
I've already looked at the Event Log and for the past two days the answer seems to be the "Windows Image Acquisition (WIA) service entered the running state."
What can I do about this?
Windows Update or Back-up and Restore shouldn't be doing this, search the root cause in your event log and also try the powercfg -lastwake command which will list what the last wake was.
Disable that option, see what powercfg -devicequery wake_armed lists and disable their wake.
Check the kernel times (figure 1) in the Performance Tab. Is the red line high?
Task Manager is limited. Use Process Explorer to get a better insight into exactly what is spinning the CPU.
From your description, it sounds like one of the drivers is having a problem. Hopefully all that is required to fix it is to update the driver. Another fairly easy solution would be to adjust certain BIOS settings depending on what is causing the problem.
Figure 1: Kernel Times
Best Answer
An excellent overview about this topic can be found at http://www.howtogeek.com/122954/how-to-prevent-your-computer-from-waking-up-accidentally/, specifically