Scroll down to the ‘Allow Wake Timers’ section and make sure it is disabled for both battery and plugged in states. In the Advanced settings window, expand the ‘Sleep’ option. Click ‘Change plan settings’ next to a power plan and click ‘Change advanced power settings’ on the next screen. To disable a sleep timer, right-click the battery icon in the system tray and select ‘Power Options’ from the context menu. If you have other plans configured, follow suit. You will need to check the status of Wake Timers for both plans. You very likely have at least two power plans configured Balanced and High Performance. Wake Timers are allowed/disallowed for individual power plans. By default, they are disabled but Windows 10 might have enabled them for particular power plans, hence your system is waking up for no apparent reason. Windows has for a long time, at least as far back as Windows 7, allowed ‘wake timers’ to wake up your system from sleep. Turns out, there might be a legit reason it’s happening you’re allowing it to (though perhaps you don’t know it). It might stay awake or return shortly to its sleep state without any reason for it coming out of it. The system will seemingly wake up at random times.
One recurring problem that many users face is when they put their systems to sleep. Windows 10 is plagued by the oddest of bugs.