Narcolepsy is a commonly under diagnosed or misdiagnosed problem that results in severe daytime sleepiness. There is a strong genetic component with some immune system involvement. It may occur in combination with other sleep disorders such as sleep apnea complicating its treatment. An objective diagnosis requires a polysomnogram and Multiple Sleep Latency Test. Management depends on the careful use of stimulant medication to control the sleepiness and other medications to control the auxiiliary symptom of cataplexy.