Some things I've found that really help:
(If you have the time to do this, do it) Avoid looking at or using electronics for abotu a half hour before going to sleep. Also, the same half hour should be a half hour of preparation for sleep. Winding down, relaxing, using the restroom, drinking a bit of water, etc. Nothing strenuous, or hectic, just calming and peaceful, then off to bed.
Also, I've found that having ambient, quiet background sound/noise can really help contribute to a good night's sleep. (Sorry to contradict you here Steve) Dead silence is always kind of uncomfortable for me to get to sleep to.
One last thing I'd like to add, which may make it harder to fall asleep (Mostly from other habits to the contrary), but should increase quality of sleep; Sleep on your back. I heard it suggested by Ryan Ford on here once and know I kind of swear by it. A good night's sleep on your back just feels fantastic, although, like I mentioned, it may seem easier to fall asleep on your side or stomache because of habits towards them.
Oh well, just my advise here.