Science says teens need more sleep. So why is it so hard to start school later?

NASHVILLE, Tenn. — High school classes start so early around this city that some kids get on buses at 5:30 in the morning. Just 10% of public schools nationwide start before 7:30 a.m., according to federal statistics. But in Nashville, classes start at 7:05 — a fact the new mayor, Freddie O’Connell, has been criticizing for years. “It’s not a badge of honor,” he said when he was still a city council member. Since his election in September, O’Connell has announced that pushing back school start times is a cornerstone of the education policy he is promoting. He and others around the country have...