Or do the opposite of what Duck said... and use some energy... Avoid caffeine after 12, avoid food for a bit before bed... I'd say maybe read a 'mild' book in bed for a half an hour or so before trying to pass out... Nothing too exciting that will keep you turning the page, just something interesting or a book you're trying to finish that's a killer during the day...
Other then that, a lot of the above look really good!!
You could also learn to Meditate, though I'm not sure if that would really help or not. It helps me clear my mind when I'm too anxious, and I can usually fall asleep faster after though.
Good luck!!