I think this is fine. I guess it's sort of a discussion on internal alarm clocks. o_O
When I was younger, as in, around the age 11 or 12, my parents used to have to literally drag me out of bed in the mornings at 8 because I wouldn't want to wake up. On weekends and days off, however, I'd be up at 7 am. I think it's just easier to get up when you're happy about what the day will deliver.
However... now it's the complete opposite. I wake up at 5:45 am every morning on weekdays, 7:30 am on Saturdays (I've got class on Sat.), and I sleep in until noon on Sundays since it's my only day off. On other days when I have nothing to do, I sleep in until noon as well. I guess it depends on the person and their goals to whether or not they can get up well in the morning. o.o