a lot of people read that, on average, you need 8 hours of sleep every night, but they don't realize that it says on average. I've found that I only need about 4 hours of sleep every night. Of course, my parents are stubborn, and they make me "go to bed" at like 10:00 every night. My solution: put a sheet under the crack of my door so light won't shine through, turn on the light, and start playing my PS2. They both work 3rd shift, so nights that they aren't off I just stay up until like 2:00 AM. Most good movies start at midnight (not to mention pr0n). I usually just code though.
