My boyfriend works nights and we're both kind of stuck in a vampire lifestyle of waking up at night. lol. We usually wake up at 9pm and then he goes to work and I stay up all night. We go to bed in the morning around 11am or later.
It really depends on the day. When I have to be at work at 9:00 (or have an early class), I like to get up between 7 and 8. When my first obligation is an 11:00 or 12:30 class, I'll get up around 9:30. Weekends are a grab bag of everything between 8:00 and 11:00.