Sleeplessness

I'm not sure why, but I have had trouble falling asleep for the longest time.  Once I'm asleep I have no problems.  It's the actual getting to sleep part that is hard.  It's puzzling really.  I will be tired all day, but when I go to lay down, nothing.  I wind up staring at the ceiling.  Well, more appropriately, the pillow over my face.  I toss and turn and eventually have to get up and try and do something to make myself sleepy.  At some point I may just have to ask a doctor "WTF?!"