DD19 is the same way. She is up late and sleeps until around noon. She scheduled her classes later in the morning and afternoon.

DD17 (18 next week) until recently was the opposite. She went to bed between 9 and 10 and up no later than 8. Lately she has been staying up until around 11 and up by 10. She scheduled her classes for earlier in the day (9:00 a.m.).

I have always been a sleeper and a morning person. In my teens, I was in bed by 9 and always up early. (Hey, with 10 kids you had to get up early to get in the bathroom and get some hot water before everyone else. LOL). With the exception of weekends, I was never able to stay up late like others.

Don't worry. Your DD is perfectly normal.