there was an article recently in the binah about insomnia. I will try to find it and post some points.
I know music before lying down, just to get sleepy and relaxed, works for some. Have you tried white noise? You can get the effect by turning on a radio talk show on low, or onto a fuzzy channel.
And something i push my friends to do is to go to bed when they start getting tired naturally, not staying up past that. Even if it messes up your schedule by having early nights for a few nights, it may get your body back in rhythm.