Make sure your bedroom is dark. Have a milky something - I'd use bread and milk in your situation, to up the carbs - about an hour before going to bed. (Rice pudding from a tin has worked, too.)
Have a non-infuriating talk station on the radio - a pillow speaker is a good idea, as it won't wake you up when the sleep setting turns it off. It needs to be something you would be interested in, and almost too quiet to hear.
Lavender and hops are also good to get the scents from. Haven't tried the hops, but the lavender oil from our local farm is effective.
If you don't drop off, get up and go and do something mindless but necessary like cleaning the oven. Or shoes. (Well, not exactly mindless, but totally different part of the brain, and repetitive.) (But bear in mind where your neighbours are. My sewing machine is next to one bedroom, and the place I'm drilling holes for shelves is next to another downstairs.)
Play the English solitaire hopping marbles over each other on a board. (Don't know why I thought of that one...)
Read something dense and tricky, so your brain forces you to sleep in self defence.
Penny