It is a windows 8.1 issue, or at least a windows issue in general. There should be one single page where you can go to in windows, one page that will let you set every single power option related to what can wake your computer from sleep. But there are several different locations you have to check. It's just a terribly coded OS, leading it to be failure prone. And to top it all off even if you set everything right, you can still have problems, ie the infamous "wake source: unknown" issue.
Seriously your computer can wake up at any time and windows cant even tell you what woke it up! This isnt a joke; its actually a real issue that has never been fixed in almost 10 years, going back to vista. Anyone want to place any bets on whether this crap will be working correctly in 2024?