Assertion: narcolepsy's brain | /r/HasProperty | awake
Facets:
Source sentences:
text: Causes The exact cause is unknown, but narcolepsy may be an inherited autoimmune disease that leads to a deficiency in hypocretin, or orexin, a chemical the brain needs to stay awake.
text: Hypocretin is a protein that helps the brain stay awake and alert.