@Bru: There could be a hella lot of reasons for that. For example, I have permenant bags under my eyes, but that's cause I was hit in the face by a foot ball when I was young which decided to rearange my cheek bones that way. Joyus.
On top of that I also have DSPS, meaning I have a very strict sleep time (it's usually 10 - 11 hours if left undisturbed) and I only get tired during the early hours of the morning, and feel really awake during the evening/night. If it weren't for school, I'd sleep till 1pm every day XD