School nights: Around 10pm
Weekends during the school-year: 11pm-Midnight
Nights (/Mornings :P) during any vacation days/breaks: Anywhere from Midnight to 3am, depending on how tired I am/how early I need to wake up the next day (or, technically, later that same day. :P).
Example: It's 2:06 in the morning right now, and I'm on Spring Break. I have to wake up at 10 tomorrow. I'm going to bed in a few minutes. I should have gone to bed about an hour or two ago. D: