Narcolepsy is a chronic, disabling condition characterized by excessive daytime sleepiness and, in some patients, falls in muscle tone related to emotions (cataplexies). It often begins in childhood or in young adults. Symptoms of narcolepsy are responsible for an important handicap in everyday life, and are often misunderstood by the family and professional environment. In addition, many comorbidities are associated with narcolepsy, such as depression, anxiety, or obesity.