Sleep hygiene is a process. I advise avoiding substances that help you sleep (Like medications or booze), because it'll make you dependent or alter how you sleep.
Personally, I have some things I do to help regulate my sleep. First, the only thing that happens in the bed is sleep (Or intimate relations). Don't read anything interesting, don't watch any TV or movies that excites you, don't listen to music that works you up, etc when trying to sleep. Do your best to go to bed about the same time every night, and get up about the same time every morning.
When my insomnia gets bad, I usually use self-hypnosis. I lay in bed, looking up at the ceiling. In the air, I imagine numbers counting up slowly. I basically imaging each number semi-large, glowing softly. It fades into existence, then out of existence. Each number should appear on an inhale (Which should last for about 4 seconds) floats for a moment (hold breathe for 4 seconds) and then fades out on an exhale (4 seconds). You can also do some relaxation exercises first, such as laying flat, then tensing every muscle for a couple moments. Then, as you exhale, let your muscles go limp and imagine yourself relaxing further and further, starting at the toes and working upward slowly.
Another thing I can do sometimes is basically jump-starting my REM cycles by visualizing things. Sometimes I just make up stories and imagine them like a movie, sometimes I just visualize a move I'm working on or whatever else. I make a point of relaxing my body, then close my eyes and just imagine whatever it is. I usually end up waking up several hours later.