I too had a sleep issue. Exercise, food, hydration & darkness is vital.

Just a brisk 30 mins walk will be fine. Have food 3-4 hrs before sleep. Don't overdo the water, but you should be hydrated. My bedroom is near a street light, so, I started to close the curtain & put sheet over it just to ensure the room is very dark.

All these helped me to get over my sleep issues.