Question: is there any corrilation between time school stars and grades in teenagers? 

Answer: I believe that schools should not start prior to 9:00 AM. It is proven that teenagers are NOT morning people. My daughter is up at five AM to get to school by 7:00 AM. Way too early. Start late, end late. Give them time for more sleep. I bet if late start schedules were tried for at least five years it could be ascertained that grades and attitudes would improve.
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