When you take GABA it effects your neurotransmitters hence the tingling feeling when you ingest it. Hospitals often use GABA as a sedative to calm patients down when they are hyper due to whatever trauma their experiencing; however I don't believe it's as effective when used for insomnia. It may make you tired or a bit drowsy, but it won't knock you out. Tylenol PM is probably more suitable for insomnia, but I always experience the benedryl hangover the morning after (horrible feeling when I'm at work). I experience insomnia from time to time, and the worst thing to do is try to sleep. Read a book, browse this site, watch TV, etc.... Eventually it should surpass. Good luck with it.