"am 90 year old male with enlarged prostate using 5 mg zolpidem tartrate per night along with 1/2 pm pill..getting up about twice per night for urination but never getting more than 5-6 hours of sleep per night.tried 10 mg melatonin  with no other sleep aid and did find it put me to sleep easily but had to get up to pee 4 times...  between 9pm and 4 am... doctors these days are trying to minimize use of zolpidem( generic ambien) and replaced the initial  prescription from 10 mg zolpidem, which worked very very well   for me, with 5 mg, which is noticerably less effective.. so, tried  melatonin..this is third night with only melatonin  and between 9pm and 2am, i was awakened for 3 pee trips..will go back to zolpidem and pm pill combination."