Usually... 10pm-1am. 10pm on a normal night, not gaming with my friend, and on a night where I am on google hangouts, and gaming with my friend, sometimes as late as 2-3 in the morning. I am not really a night owl, but love playing games at night.
Usually 12 am when there's nothing early in the morning and 11 when there is. 10 on school nights. I don't go to sleep later or wake up late. Even though it might seem cool to do all-nighters or just go to sleep really later it completely destroys your body (I'm legally a kid too, just being honest).
During holidays or weekends I go to bed between 11 pm and 1 am On weekdays I go to bed before 11 pm because I'm a teacher and can't afford to be sleepy during class.