Windows 10 mysteriously boots up.. WHY?

Question

My Windows 10 machine would sometimes automatically boots up at night for no apparent reason. Is there some sort of log that I can check that would give an explanation?

Answer 1

1. Report information about the last event that woke the computer: powercfg /lastwake
2. Lists devices that are user-configurable to wake the system from a sleep state: POWERCFG /DEVICEQUERY wake_programmable
3. Lists devices that are currently configured to wake the system from any sleep state: POWERCFG /DEVICEQUERY wake_armed
4. Returns all devices that support waking the system from any sleep state: POWERCFG /DEVICEQUERY wake_from_any

After finding culprit maybe you can remove the SW or HW. If not reference @Alex's answer to disable wake timers in power settings GUI

Links: https://docs.microsoft.com/en-us/windows-hardware/design/device-experiences/powercfg-command-line-options https://msdn.microsoft.com/en-us/library/dn898599(v=vs.85).aspx https://ss64.com/nt/powercfg.html

Answer 2

To prevent windows 10 from automatic wake up one need to disable wake up timers in:

Control Panel\All Control Panel Items\Power Options -> Change plan settings

Answer 3

One of the multiple reasons could be the Wake-On-LAN feature.

Is there any mechanism in your network that would send out Wake-On-LAN packages? Also is your computer configured to respond to such packets?