I could just fall over!

I don't get it, I have done nothing to cause me to be so tired. Last night I started feeling like I was dragging my feet and I was starting to feel wore out. I went to bed about 10 and slept til almost 1 this afternoon! I've had to force myself to stay up, if I close my eyes I'll be gone again! Maybe I'll take a provigil and a shower and make myself stay awake until bedtime tonight. I just hate to though, I mean if there's some reason why my body is wanting me to rest shouldn't I give in to it?