Which hormone regulates the sleep–wake cycle?

Tart cherries, aka sour cherries, and eggs are food sources of melatonin.

Dorothy , me too ; not a knockout pill but i find as long as Im tired it will give me 5-6 hours sleep - and the plus is you wake up fresh, not any drowsy side effects -

I sometimes take that to help me sleep.

Carla, If you do take a melatonin supplement and experience depression, stop taking it.

Try melatonin for GERD, I promise it works, take at night as it can make you sleepy.