Insomnia

Insomnia (and I am not talking about the movie) sucks. I am too exhausted to read, yet cannot seem to fall asleep. Instead I have been searching for jobs and watching Harry Potter movies 2,3 and 4. One of these days I will go off on the movies and how they do not do the books justice, however the movies are a quick fix as opposed to reading the 600 plus page books. So what could help me fall asleep? I could try counting sheep, but my brain really doesn't want to work. How can I be this tired, but not able to sleep?