I think it’s non issue. The lack of sleep is avoidable by going to bed earlier. Going to bed later would - likewise - make for less sleep.

If the school day shifted later, so would all the after school activities that keep them from getting sleep. They’d just have less daylight after school.

As a teacher, I’d personally rather have a 9-5 schedule than 7:30-3:30. But I don’t think it would have the effect on students that people think it would.

Summer school starts later. Kids still show up later and complain that they didn’t get enough sleep. They’re just going to be at 3 instead of 1.