text: why do we have to go to public school so early in the morning in the u.s.a. ? i hate waking up so early in the morning. i think i would feel better and do better if i could sleep later. i am a teacher and had the same question. it has been proven that teenagers get the best sleep from 2 am - 10 am. but then why do we start school so early?  my principal answered this question simply. because there are after-school sports and clubs which rely on daylight for their practices. that seems like a pretty logical answer to me. i don't want to get up early, but now at least i understand why.