Sleepy

Why in the world am I so sleepy? I don't understand. Last night I went to bed early (this is very seldom, I tell you)...around 11:00 p.m. I fell asleep while hubby was giving me a leg massage...I woke up at 6:30 a.m. just before hubby left for work... At around 3:00 p.m. I had a nap, but I still feel sleepy...I am not pregnant! ehehehe I just find it so interesting coz when I have 4 hours of sleep I am so alive and kicking but when I get 8 hours of sleep, I feel more sleepy. Crazy isn't it? :)