This guy has a pretty good series on insomnia with several possible treatments, most avoiding drugs and alcohol.
The Cliff's notes:
Reset our internal clock by keeping regular hours including meals and in bed by 9-10, getting plenty of exercise during the day outdoors if possible, and controlling light in the evenings. Bright overhead sunlight tends to wake us and subdued off-white light or fireplace tends to cue our internal sleep cycle. Keep the bedroom very dark while sleeping. Stay off the screens in the evening.
https://youtu.be/vdc8JonEax8