On school nights I try to be in bed by 1-3 am since I have 9 am classes. On weekends I have been known to go to bed as lat as 5 or 6 am (last year at a birthday party my friends and I ended up going to bed at 10 am. It was pretty epic.) Next semester I don't start until noon on Monday,Wednesday and F and 11 am on Tuesday and Thursday so I image I will be staying up pretty late.