If Benadryl has worked for you, try Vitamin B6 (seriously). Helps with Histamine Intolerance, a hidden cause of insomnia.

I discovered this years ago when I became very sleepy after eating salmon skin, which is high in b6.

Be careful eating foods high in histidine that are not fresh, like seafood and pork - the bacteria converts the histidine to histamine.

I take vitamin b12 too which is very helpful for adrenal function and keeping estrogen thus cortisol down.

Cortisol and histamine are major culprits in insomnia. Lemon water helps bring down both and soothe the adrenal glands.