When I was 13, I didn't do my pre-Algebra homework one night because spent those three hours playing Ocarina of Time, which I had just purchased. Got a D on the homework the next day since I did try to finish some of it (didn't care though. Got an A in the class).
This happened to a former coworker of mine. She was (still might be) a huge WoW addict. I had to work a normal 8.5 hour shift (Gamestop doesn't pay for the half-hour lunch), but my manager had car troubles and couldn't get there. No other store could spare anyone, and the ASM couldn't make it either. So I was basically gonna spend 9 hours working alone. My coworker was supposed to come in at 6, but by 6:30, she wasn't there. I called her and she thought I was calling her at 6:30 AM, since it was dark outside. Apparently she'd gone to bed somewhere around 5-6 AM because she was up all night playing WoW.