This won't be much help to those with partners unless you can sleep in headphones, but I have some story audiobooks and I have found listening to one of them as I go to sleep really helpful. I pick stories I know well that are fairly gentle in nature (James Herriot, Jane Austen, E F Benson) and seem to drop off after the first 3 or 4 tracks. I don't listen to new CDs in this way in case I stay awake listening for the end. But once I've heard them a couple of times, they keep my mind just occupied enough to stop it buzzing with other things and as I already know where the story is going, I find I just drift off without realising it. Occasionally it doesn't work, then I just sit up and read till I can't keep my eyes open. Again, familiar books so nothing new to keep me awake.
BTW, I always find it harder to sleep when there is a full moon. Bizarre. Does anyone else have this problem? Nothing to do with the light as my curtains are drawn.