"wow...i just started taking 10 mg. (time release) melatonin after not having any luck with several prescription drugs. i would have to resort to taking diazepam to fall asleep, and then i&#039;d wake up with diazepam grogginess. i have been taking the melatonin for a week now. i take it and then read for about 30-40 minutes. i fall asleep and don&#039;t wake up all night (which i haven&#039;t done since i was a child). also, i wake up feeling refreshed and ready to take on my day...no grogginess. a friend who is a nurse told me about this. i highly recommend it. i am using natrol brand that i bought at walmart. give it a try!! ~~ shannon"