What was/is the most annoying thing about Windows when you were/are using it?

Put my PC to sleep, then i go to sleep. 3am rolls around and my PC turns on and sits at the log-in screen.

This seems to be an issue only after windows 7 for me. It can't be updating because there's nothing happening when i check on the windows update, and it will do this all night until i unplug the damn thing. Then i get a couple months of this issue not appearing.