Yup, we can’t get bus drivers so they stagger schedules. One local district had the secondary campuses start later, and the parents have complained precisely because the younger kids have no one to watch them in the afternoon. Plus 5 year-olds aren’t really at their best learning at 7:30 in the morning. When I taught at a high school we moved our start time feom 8 to 8:30. The kids were still tired because they just stayed up later. Most of my tired kids were up working or caring for siblings - or their own children. Starting later didn’t really make a difference.