Is this all the time or just when you are depressed? I also sleep about 8 hours every night and could nap every day. I am more tired when depressed, but even when I am feeling great I can still be able to nap. I have always needed sleep. My husband can do fine on 5 hours a night, but that would be awful! When the kids are in school I go to bed about 11ish and am up at 6:30. Sometimes I take a nap around 2 till I have to pick them up.