As far as bed times. That should vary from person to person. I was known (esp towards the end of my college days) to get by on about 3-6 hrs of sleep during the week days that i took whenever and after a 3-4 am bedtime I never got out of bed before noon (except on football saturdays) on the weekends.

As a college adult you are responsible for your own bedtime and course work. While its important to mix fun and work during those care free college days, don't forget your first responsiblity is to yourself and your school work. Not getting enough sleep and eating badly will result in getting run down and sick (I'll refrain from going into detail about my semester and a half bout of that). Learn time management and you'll be fine for those 2 am "study" parties... err sessions.