GABA (Gamma-Aminobutyric Acid) is a neurotransmitter, or chemical messenger, that slows down your brain by blocking specific signals in your central nervous system. By slowing certain brain functions, GABA is thought to be able to reduce stress, relieve anxiety and improve sleep.  Melatonin is a natural hormone that is produced by the pineal gland in the brain and then released into the bloodstream, when it gets dark.  Melatonin facilitates a transition to sleep and promotes consistent, quality rest. When used together, GABA and melatonin work symbiotically, helping you fall asleep faster and sleep more soundly.