Assertion: narcolepsy's brain | /r/CapableOf | play role
Facets:
value: in rapid eye movement
type: MANNER
value: in wakefulness
type: TEMPORAL
Source sentences:
text: Hypocretin is a neurotransmitter in the brain that plays a role in wakefulness.
text: In very rare cases a cause for narcolepsy has been through traumatic injuries involving a part of the brain which plays a role in rapid eye movement (REM) sleep.