Good sleep hygeine tips that I learned (try to recall atm)
Don't do day-time activity in the same room that you sleep. You need to program your body to get tired in the room you sleep in. I used to try to get some work done in my room. I've changed that since then.
Racing mind: When your thoughts start turning towards stuff that keeps you awake, imagine yourself putting your thoughts into a jar, closing it, and putting it on a shelf for later. Everytime you notice your mind wander towards stuff that may stress you out or keeps you awake, remember to do this "jar" trick. After awhile it will get easier to do it.
I've done this and it works for me - though by the end of the night my shelf was getting pretty full