Even when I was in grade school, my schedule went something like this: I'd go to bed around 9 PM, get up at 3 AM to do homework, then take an hour-or-so nap before I had to get up again for school.
I was always a morning person to the extreme ("morning" to me was about 5:30 AM, even on my days off.) Thanks to all kinds of changes in my work and life schedules, I've become some sort of hybrid who just doesn't sleep much at all anymore.
The bad news is, you'll find me roaming around at all different hours. But the good news is that I can adjust to virtually any time change without much trouble or jet lag.