After lunch, we went out to help my father build houses, then off to sports practices (typically two separate practices for two different sports) and classes at the local college. By the end of the day you're exhausted!
A large part of why my parents were so strict is because we were really poor and my parents were determined to not only get out of poverty but also to teach us a good work ethic.
So part of me is really biased in thinking "these kids have an easy schedule, why is it so hard for them to get going in the morning?"
I wouldn't recommend my upbringing necessarily, but also can't help but wonder if kids had a stricter routine, regularly exercise, good diet, and family support if it wouldn't be slightly easier for them to start the day early.
But also on the flip-side I think it's great to let them sleep in because I remember how I felt, and how my friends felt.
Lastly, perhaps public education is partially at fault? Sitting in a classroom for hours every day is exhausting, so how about a more hands-on method of learning where kids actually stand at a white board and write out problems and solutions - something that might work in the lecture part of chemistry, physics, math, and perhaps other courses? - We did this in homeschool as well as at the local college I attended and it absolutely helped me wrap my head around things better!
I ultimately have no dog in the fight as my family and I do our own thing, this is just my opinion.