I have big pleasure in going to sleep, because worries are going away for a few hours. That is why I am very sympathetic for those who can't sleep, it must be very hard.
I find the idea of puffyprue is very good. One should not stay in bed thinking he should fall asleep. Staying in bed is a value in itself. Arrange an extremely comfortable bed, mattress and pillow well fit to your body. And just lay there letting the mind float. Find comfortable postures and shift from one to another (don't twist randomly).
Don't really want to be a teacher, just my thoughts about sleeping.
And of course, yes, ask the doc.

Hey, nigthbird, you really had it down to a science!