I don’t get how this is supposed to work with sports and other activities. In high school I had water polo/swimming practice mornings at 6:15. Is that now illegal?
That means you have to be asleep no later than 9, which means depending on the time of year it may still be light out, and certainly the community is still fairly active. Plus I recall a recent study that essentially said teenagers are naturally night owls.
Expecting teenagers to be asleep by 9 is a losing battle.
"In the teenage years, the hormonal response to the 24-hour daily light/dark exposure that influences circadian rhythm is altered, making adolescents physiologically yearn to stay awake later at night and to remain asleep later in the day."
https://www.neurologytimes.com/blog/teenage-circadian-rhythm
But, you could also move practice to the afternoon like most school sports. None of my high school's athletic programs were before class.