GABA is the main inhibiting transmitter in the central nervous system. The opponent of cortisol which facilitates stress and alertness, so to say. I dare to sa

GABA is the main inhibiting transmitter in the central nervous system. The opponent of cortisol which facilitates stress and alertness, so to say. I dare to say that everything that calms the body, like alcohol, other drugs (GHB), or going to sleep has to do with GABA ;).