When I don't have 8am class I'm u p till 3-4 myself. I only need 3-5 hours of sleep to function though. Must more or any less and I'm exhausted for some time.

 

Well, I think I need like 87 hours of sleep to feel rested, but I have yet to test that theory. All I know is that anything in between 0 and 13 haven't really done the job. Maybe I'm just naturally sleepy (I could be a dwarf! )...