For me, this works best if taken as soon as you realise it's going to be one of those nights. I take it with a glass of water, and a slice or two of bread. Ideally, try this when you'll be able to devote 6-8hr to sleep--after that I always wake up 100% refreshed. Best of luck!
I have used Gaba for years for insomnia with great results. I used the Now brand in powder formed with a 5 mg of B6. The key is to take right before you go to bed on an empty stomach. It needs to get to the brain receptors to make neuro-transmitters. I used anywhere from 2,000 - 5,000 mg, depending on how I was feeling. Anything over 5,000 mg did not do any good. Beware that you may get rapid breathing, heart rate, or shortness of breathe for a minute. This because the Gaba relaxes the blood vessels and blood is moving faster; I did. It seem to be the more intense I felt the more I would experience these symptoms. I did research on Gaba a lot before I used these higher amounts. The lower amounts of Gaba had no effect on me, but they may you. Don't take my word for it you can research it too. I hope this helps.