"Down With 8 A.M. Classes: Undergrads Learn Better Later In The Day, Study Finds"

"While most colleges have start times of around 8 a.m., Jonathan Kelley advises NPR Ed that the ideal start time would be more like 10 or 11 a.m.

The reason: People fall into different "chronotypes," which people know as "early birds" and "night owls." In this sample, night owls outnumbered early birds by far.

The reasons for this are biological, says Evans.

"There has been evidence over time from specific studies indicating that teenagers' body clocks are set at a different time than older folks," she says. "Medical research suggests that this goes on well into your 20s, so we decided to look at college students.""

http://www.npr.org/sections/ed/2017/04/19/524348257/down-with-8-a-m-classes-undergrads-learn-better-later-in-the-day-study-finds?utm_source=twitter.com&utm_medium=social&utm_campaign=npr&utm_term=nprnews&utm_content=20170419

Related: CDC on high school, mine on morning stuff...