If you have the problem that your devices (PC, notebook) with Windows wake up at night, then you either have a cat or it is the automatic maintenance mode of Windows.
However, there may also be other programs that want to do something at night. To find the culprits on the program side, do the following:
CMD as Admin:
powercfg -lastwake powercfg -waketimers powercfg -devicequery wake_from_any
The culprit is usually located here:
System control\All system control elements\Maintenance center\Automatic maintenance
Allow the computer to be deactivated by scheduled maintenance.