> For example, is is known that teenagers would have health benefits from later school start time but it's almost impossible to implement that due to rigid cloc

> For example, is is known that teenagers would have health benefits from later school start time but it's almost impossible to implement that due to rigid clocks of everybody else. It absolutely has nothing to do with that. It has everything to do with people essentially not believing that it actually matters. And to some extent due to convenience for parents who drive their kids to school. My local school system does have high school students starting late relative to elementary schools.