Sleeping too much?

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I am the earlist one who go to bed but the last one to get up everyday in my dormitory.All of my roommates say"you sleep too much",they often get up around 7:00 in the morning,for me,it is 8:00.Sometimes I also feel that I waste the best time just sleeping,but I am really sleepy!I ever told mom about this,she joked"me too,maybe it's genetic".So,have you ever been in such situation similar to this.