Narcolepsy is a chronic disease of the central nervous system. Excessive daytime sleepiness (EDS) is the main symptom and is present in 100% of patients with narcolepsy. Other main symptoms of narcolepsy include: • loss of muscle tone (cataplexy), • distorted perceptions (hypnagogic hallucinations), and • inability to move or speak (sleep paralysis). Other symptoms include nighttime sleep disturbances and automatic behaviors (patients perform certain actions without awareness). All symptoms of narcolepsy can be present in various combinations and degrees of severity. Narcolepsy usually begins in adolescents or young adults and affects both sexes equally. The first symptom to appear is excessive daytime sleepiness, which can remain unrecognized for a long time as it develops gradually over time. Other symptoms may follow excessive daytime sleepiness for months or years. How common is narcolepsy? The prevalence of narcolepsy is similar to that of Parkinson's disease and multiple sclerosis. In the United States, the National Institute of Neurological Disorders and Stroke estimates that narcolepsy affects one in 3,000 people. Narcolepsy often goes undiagnosed or misdiagnosed for several years. This may happen because doctors do not consider the diagnosis of narcolepsy frequently enough. They may think of narcolepsy only in people with the main symptom of excessive daytime sleepiness. Narcolepsy cannot be considered in the evaluation of patients who consult a doctor complaining of fatigue, exhaustion or problems with concentration, attention, memory and performance, as well as other illnesses (seizures, mental illness, etc.). What are the causes of narcolepsy? Progress has been made in the field of narcolepsy. in recent years in the deterrence...... middle of paper ......ons, and sleep paralysis), of what is called the "narcolepsy pentad" (a set of five symptoms). Automatic behavior may occur in 60-80% of patients with narcolepsy. We speak of automatic behavior when patients perform certain actions without being aware of them, often with unusual use of words (irrelevant words, speech errors). This behavior occurs when the patient oscillates between sleep and wakefulness. Other complaints associated with narcolepsy may include eye disorders due to drowsiness, such as blurred vision, double vision, and drooping eyelids. How is narcolepsy diagnosed? The diagnosis of narcolepsy is based on a clinical study. assessment, specific questionnaires, sleep diaries or logs, and sleep laboratory test results. Clinical Assessment The clinical assessment includes a detailed medical history and physical examination by a physician. Questionnaires