In some places, the school day for teenagers runs from 9:00 a.m. to 4:00 p.m. But in the United States, the teen school day often runs from 8:00 a.m. to 3:00 p.m., or even 7:00 a.m. to 2:00 p.m.

Early to rise isn’t making kids wise, say critics—it’s making them sleepy. For optimal alertness and well-being, teens need 8 to 9 hours of sleep a night. So, should early-start schools move to a later start time, even if it requires buying more buses or switching start times with elementary schools? Or is this impractical, and would it do little to remedy the tired-teen problem?