Sleep, glorious sleep...

OH this is infuriating!!!! Why cant I sleep at night? I've been absolutely exhausted all day. I was physically ill for most of the evening. Fatigued. Now it's 1am, and my body wont go to sleep. I am wide awake. This means another day tomorrow of complete exhaustion. I got up 2 hours early this morning thinking the less sleep I got the easier it would be to sleep at a normal time tonight. So here I am. I don't like the word insomniac. I don't think that's my problem. I don't think that's denial - just lack of sleep.