Narcolepsy.

Narcolepsy is among the leading causes of excessive daytime sleepiness and is the most common neurologic cause. Its classic form--narcolepsy with cataplexy--is a distinct neurologic disease with characteristic clinical and paraclinical findings. The history, epidemiology, clinical picture, pathophysiology, cause, diagnosis, and treatment, both pharmacologic and nonpharmacologic, are discussed in detail.