I actually do get occasional insomnia. It'll happen randomly for like week long spurts. Nothing too bad, though I only get 6hrs of sleep a night anyway. Yea it makes work hell the next day, and I usually go home crankier than a newborn with diaper rash, but its not too bad. I have almost no tricks to help with the actual insomnia, but getting to sleep on a regular basis I can help with.
My first and most used one is music. I'm not talking lullabies or anything fancy, just music. It could be whatever you like, rap, rock, heavy metal, jazz, I don't care. But if you just put something on very low and close your eyes, even if you don't actually sleep, your body will get the idea and at least rest.
My second one is on the same track as the first which is soothing sounds. Yea I know, how corny is that! But it works for me. Now I'm not saying you need to go get one of those fancy machines that plays ocean waves and sea sounds. I went to the Dollar Tree in my area and picked up a bunch of $1 CD's that have that paired with stuff like piano, flute, and koto. I love the stuff before bedtime or in the tub. Its affordable, pretty and easy to do.
The third is a group thing. I like to get petted to sleep. It doesn't always work, but mostly it'll do the trick. I just like the affection of someone running their hands through my hair, its nice and soothing. Rubbing my tummy also works.
And last but certainly not least is Buffalo's all time favorite, reefer. Oh yeah, I went there. Its always such a taboo subject that people would rarely recommend it for something useful. The truth is, it works. I Get just one hit in me and in 10min I could lay down and pass right out. I don't even remember going to sleep sometimes because its such a good fulfilling sleep.