I've had sleep issues since my late teens (I'm 42 now). Here are a few suggestions:
Magnesium Citrate supplements (I'm taking 400 - 1000 mg per day)
No TV, computer, iPad, etc for a hour before bed.
A white noise generator (a fan works well, just point it away from you if your cold)
Some kind of "bed time" tea 1-2 hrs before bed.
Reading fiction or meditating before bed.
If I'm really struggling I take melatonin
However - even with all these things, if I'm under a lot of stress I still have trouble.
"You have succeeded in life when all you really want is only what you really need." ~ Vernon Howard