"“There’s this image of American teenagers as lazy and loving sleep,” Pratt said. “But the reason they need those later start times is because their circadian rhythms — their biological clocks — mean they can’t get high quality sleep until after 11p.m.”...
Pratt said that while in your teens, your body isn’t totally ready for the full-on adult schedule. For a huge number of teens, their bodies keeps producing the sleepy-time chemicals (melatonin) between the hours of 11 p.m. until well into the morning. So, a 7:30 a.m. calculus class could just biologically not work."
http://www.mtv.com/news/2234983/get-more-zzzs-to-get-degrees/
And also, a lot of people don't have a morning chronotype St any point in they're life (see my short response piece to an essay about how everyone should wake up early)
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