I've always been a night owl, too. It's when I get my best energy.
Now that I'm working 7 days a week, 12 hours a day, I fall asleep before midnight out of pure exhaustion.
When I'm home and get those things called "weekends," I always manage to throw my body-closck out of whack real good on those Friday and Saturday nights.
It's so peaceful and quiet at night...everyone's asleep, and you can focus on things more.