Have you tried diphenhydramine aka Benadryl, it's an anti-histamine and used as an over the counter sleep aid. I use it with 1-3 mg of melatonin, also used as a sleep aid! Melatonin is a dietary supplement!
Is it only effective when taken with Melatonin?
I find that diphenhydramine wires me up to the wall outlet and I buzz my ass off with no chance of sleep whatsoever. I'm not contradicting you, but I know I'm hooked up funny, somehow.
I forget the dosage, but a doctor once gave me a supply with instructions to try one for three nights, then two for three nights and the call him. By the fifth night, on two of them, I was so wired I had the shakes from adrenaline or something and I got less sleep that week, than ever before. The next day I called him and he gave me something else. None of the next things worked, either. It was years ago.
Is Melatonin an over the counter supplement?