Usually about 4-5 hours a night, but I drink like 5 cans of Diet Coke a day so that I can function. I've always been a night owl, but my schedule doesn't work with that, so I always end up going to bed at 12 or 1 and waking up between 5 and 6. Last night, I went to bed at 1, and I woke up at 4:30 today (I had a Science Olympiad, dorky, I know). It's 11 and I still haven't gone to sleep...