I'm a night person. Usually on between 4pm and midnight or as late as 2am. I have been a night person all my working life. 2nd shift. No alarm clock to wake me up. I shop when everyone else is asleep and I drive the opposite of the traffic jams. It is a great life although I am normally awake by 8am everyday.
I get between 6-7 hours of broken sleep. I work 60 hours per week. Been this way as long as I can remember.