Don't drink any caffeine drinks (coffee cola hot-chocolate) after 6PM in the evening. Don't lay in bed thinking about worries or problems... instead think of UN-EMOTIONAL things such as recipes you want to make... the motorcycle you are re-building... the art piece you are making...etc.
SOUND. small sounds in the room can keep you awake... such as neighbor closes his car door. cat meows in yard. crickets chirp... THE CURE is to mask those sounds with a "sound-machine" It is just a little radio-clock thing that they sell everywhere and it has settings for playing "raindrops", waterfall, or other soothing sounds. I use the one that sounds like a constant waterfall. Small room noises no longer wake me up.
LIGHT... If you can't make the room totally dark, then use something to cover your eyes... a scarf or a specially made eye shade thing.
Those things should cure 90 % of anyones sleeping problem. If the spouse snores like a LOCOMOTIVE... you will need 2 FEATHER pillows. No other kind will work (trust me on this). Place one on each ear. It won't make the snoring in-audible... but makes it TOLERABLE.