"i have been taking melatonin every night for about 3 years and it works good for me! i have never had my sleep problem &quot;diagnosed&quot;....but i can tell you that if i don&#039;t take something to make me fall asleep i can easily stay awake for at least 36 hours and then in order to fall asleep i still have to take something! i have tried tylenol pm and sometimes use pain pills and muscle relaxers (ruptured disc in my neck) and i still need melatonin with any of them! 
i have noticed that i seem to need more than i started out taking."