F.Y.I. diphenydramine = benadryl. sometimes plain "benadryl" is cheaper than sleep products contianing it. Any sleep med will lose it's effect after a period, and may cause your problem to worsen. Watch caffine intake after noon, and try to find a link between sleeplessness and behavior, stress ect., it may be secondary to one of these. Ambien works great but is for short term use, typically 2 weeks, much more so for benzo sleep aids, over 30 days they become more problematic than helpfull. Any med is more effective when used in combo w/ behavior modification practices. I have resolved my sleep problems to a managable level, and stopped taking sleep meds.