During school, I usually stayed up past 4:00 am. There was always too much to do to go to sleep. I would usually stay up programming or something.
Now, I go to bed around 2:00 am, and probably about once a week stay up until the sun rises.
It\'s funny though. I stayed up really late on school nights, but now that I don\'t have to wake up for anything, I go to bed early.