Wow.
Check out this amazing stat on car crash prevention in the local paper (here in southeast New England, USA) re adjusting school start times so teenagers don't get up at 6:00 a.m.:
"A study…at the University of Minnesota in 2014 found that in Teton County, Wyoming, crashes involving students 16 to 18 years old…reduced by 70% when they changed their school start time from 7:35 a.m. to 8:55 a.m., the most drastic change among schools involved in the study."