Sleeping time

I slept for almost 12 hours last night!! I got home from work and I was really tired. I ate some dinner, got in my pajamas, and then turned on my Jefferson's DVD. When 7:00 rolled around, I was like, man I should just go to bed. . .and that is what I did! I got out of bed this morning at 6:40. It is a great feeling to get that much sleep, but at the same time, it makes me wonder...What is going on with me?