I found this article on The Today Show website, I was actually looking for something I saw on the show about insomnia but I couldn't find it. They were discussing a technique where you move your blood through your hands by holding them away from your body to cool yourself down while you're trying to fall asleep. I wish I had paid more attention to it, I can't remember how to do it exactly.
http://today.msnbc.msn.com/id/23003124/