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If you haven't done so, try removing dust mites or other potential allergens from your bedroom.

Maybe try move to another location.

Have you had your vitamin d levels checked? Worth checking out what Dr. Stasha Gominak has written on the subject.

And iron

Iron was huge for me. I’m a blood donor. Last time I went I couldn’t sleep for a week until I started cramming chicken and spinach down my maw like there was no tomorrow. Got rid of all the issues I was having.

B vitamins are another big one, especially if you drink sometimes.

+1 on iron. Iron deficiency has surprisingly widespread effects.