Glossary of Terms

GABA-related hypersomnia

GABA-related hypersomnia happens in people who have both:

• A hypersomnia disorder, such as:
  • Idiopathic hypersomnia
  • Narcolepsy type 1 or 2
  • Hypersomnia or narcolepsy associated with another disorder
  • Kleine-Levin syndrome
• A substance in their cerebrospinal fluid (CSF) that makes the effects of GABA stronger, causing sleepiness. Substances that cause sleepiness are called somnogens.

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