Why Sleeping In On School Days May Be Good for Teen Health

California teenagers can snooze a little later this year, thanks to a newly implemented law that says most high schools and middle schools cannot start before 8:30 a.m. and 8 a.m., respectively.

That law—the first in the country to set statewide mandates for school start times—isn’t only big for California students, but also for public-health experts fighting against what the American Academy of Pediatrics (AAP) has called an “epidemic” of teen sleep deprivation. Both the AAP and U.S. Centers for Disease Control and Prevention have long opposed early-morning class times and advocated for middle and high school...