Can a person sleep to much?

Well i get anywhere from 3-9 hours a night an average of 6 hours. I constantly fall asleep every time i go in a car so about another hour there an then i will fall asleep watching tv, doing homework, in school, at snack recess, and sometimes in cles adding up to about another 1 and a half. my dad keeps saying that I am sleeping to much and that something is not right or healthy plus i am constantly thristy. I dance about five hours a week as well. I am 13.