I'm so jealous! ya majority of the year (since I was out of school for a while and have no job) I sleep all day and up all night, once school starts I will have no choice but to be up in the morning, although my sleeping problems is why I dropped out of classes multiple times. I can't get out of bed in the morning, I need to take night classes or something.
Sometimes for a little while my sleep pattern will be like waking up around 6-7am, and going to bed around 8-9pm(sucks on weekends though when I want to go out at night), but I mostly LOVED it! but sure enough within a couple weeks it goes back to 'normal', which is how it is now.