n. an extreme tendency to fall asleep in quiet surroundings or when engaged in monotonous activities. The patient can be woken easily and is immediately alert. It is often associated with cataplexy, sleep paralysis, and hypnagogic hallucinations. One in 2000 individuals may be affected. Narcolepsy is strongly associated with reduced levels of hypocretin in the cerebrospinal fluid. —narcolepticadj., n.
Subjects: Psychology — Medicine and Health.