My son and I can happily stay up all hours at night and into next morning. But, when we finally do go to bed - we sleep in till 3 or 4 pm. I've been known to sleep in till midnight, if no one disturbs me. On senior bus days however, I have to be up at 7:30 am which means I mostly get 2-3 hrs. sleep. Both of us are more productive at night. It's quiet and the nuisance phone calls haven't begun.