Gaba is good for quality sleep. It makes you feel like you've had 8 hrs when you might only have had 6.

what is gaba?

Melatonin works for me. 3mg is all I need.
Oh, and I also use ZMA(not the two together though). ZMA seems to help me get a more restful sleep. I don't like to use Melatonin all the time as I sometimes feel like shit when I wake up if I take it too late. So, my later nights, I use ZMA and that seems to work for me.

Gaba is Gamma Amino Butyric Acid. I think its just been banned together with the Andro/19-Nor products here in the U.K. Our supp co's can sell their existing stocks however, so I've just stocked up.

The main use of GABA is its ability to aid the body dump out Growth Hormone. As you're probably aware, the body produces the most GH when we sleep (deep REM sleep). GABA is good at helping you achieve quality REM sleep therefore maximising the windows of opportunity for the production of GH. You also wake feeling refreshed and like you've had more sleep than you actually have had.