I couldn't find the earlier post. I've gone several nights now with the 4 amino acids (Theanine 500mg, 500mg GABA, 5HTP 100mg and Taurine 500mg). I've been able to drop down to 1/8th tab of Ambien! I use to be a light sleeper but lately I'm knocked out hard. I don't wake up for sirens, thunderstorms, bathroom door slamming. I can take the individual aminos during the day and it doesn't make me sleepy. Taurine is in Energy drinks Theanine is found in Green Tea 5HTP is mostly derived from the giffonia seed, but no real reports of drowsiness. GABA is found in fish and wheat bran. Another insomniac friend of mine is also trying the above too. He reported feeling real drowsy but did toss-n-turn a little less. His brain fog was better the next morning. I think [theory] that it take a while for GABA to build back up in the brain. I've been finding that I sleep better over time. My 2nd theory is that raising GABA levels doesn't make one sleepy but rather helps you go to sleep if you are sleep deficient.