| GABA | Gamma-Amniobutyric Acid |
| GABA (Gamma-Amniobutyric Acid) | Major neurotransmitter in the brain which is considered to be involved in muscle relaxation sleep diminished emotional reaction and sedation. |
| Gastroesphageal Reflux Disease (GERD) | Flow of stomach acid upwards into the esophagus that can cause arousals and disrupt sleep. |
| Genioglossus tongue advancement | A possible surgical treatment used for sleep apnea and/or snoring improving the airway behind the base of the tongue. The genioglossus the main tongue muscle relaxes during sleep often allowing the tongue to fall into the airway. The muscle attaches to the middle of the lower jaw. A segment of bone containing this muscle is pulled forward and stabilized opening the airway space behind the tongue. |
| GERD | Gastroesophageal Reflux Disease |
| GHB | Gammahydroxybutyrate (a substance occurring naturally in the brain. To be sold as Xyrem) |
