What Do You Do When You Can’t Sleep?

I think I've finally figured out the key to a long nights sleep. The room temperature has to be just right. I've found that if I get the room down to 64 degrees then I sleep like a baby (a good baby) all night. The question is what do you do when you can't sleep? Do you drink water? Do you turn a fan on? Do you crank up the heat? Do you Facebook stalk until you pass out?