Melatonin
"Didnt work for me, within an hour of taking it I had hives, also seemed to irritate my bladder so I was up peeing every half hour until  3 am! I do suffer from urticaria so its probably more about me than the product. Disappointed as I was hoping it would help me sleep. But itching and peeing does not make a restful night! I stopped taking it after  nights."