natural night owl, but I work First Shift (6a-2:30p), so I get up 4-5am on workdays, but non workdays I'm rarely out of bed before noon.
I group them that way, as I Don't have a typical m-f Schedule. all I can say for certain is i get 2 days off a week, and they're not often consecutive.
at the other end of the day....some days i'm passed out by 10p, some days I'm "forcing myself" to sleep at 12:30-1am, knowing full well my alarm is going off @ 4....