I've tried Magnesium, Melatonin, turning off all devices hours before bed, turning off all lights hours before bed, sleeping in a cold room, etc.
I'm not overweight or unhealthy. I take in zero caffeine, zero alcohol/zero drugs. I do take a daily PPI.
I feel tired a lot, and I seem to feel more tired on days when my watch (Xiaomi Smart Band 3) reports the lowest deep sleep scores (I consider how I'm feeling first, then look at the sleep score to compare).
I want more deep sleep, but try as I might I don't know how to make it happen.