Why school should start later for teens

Although we have passed the high school stage now, we don't have to get up so early, but we still have classes at eight o'clock in the morning. For us, we will feel very early and tired when we go to class at eight o'clock in the morning. As for high school students who come to school late, not getting enough sleep will only make students want to sleep in class and reduce their learning efficiency. I think it is very necessary for teenagers to delay class for the sake of their health.