Ignore the horsecrap posted before this! Every child is different, and your daughter might just need extra sleep. If you can take her to the doctor and have everything checked out, but i am 90 percent sure that she is just fine. My son slept just like your daughter and he is fine and a straight A student. My daughter on the other hand rarely slept longer than 2 hours at a time! Every single child on the planet is different than the next, and taking advice from people online can lead to erroneous assumptions like the ones before me. She could be going through a phase as well, and if so will grow out of it. The best advice is that if yo are really worried, take her to the doctor and get PROFESSIONAL advice hun. That way you can be safe rather than sorry. Huge hugs and best wishes.