CALIFORNIA’S MANDATE requiring later start times for middle and high schools is already yielding results, with students sleeping more, reporting better mental health and earning higher math and English scores, according to a new study. 

The new working paper from the National Bureau of Economic Research examines the effects of Senate Bill 328, California’s statewide mandate for later school start times. The law, which went into effect in 2022, requires most middle schools to start no earlier than 8 a.m. and high schools no earlier than 8:30 a.m.

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