<prompt> Narcolepsy is due to the abnormality inHypothalamusNeocoexCerebellumMedulla oblongata  <response>: Narcolepsy: Types central nervous system dysfunction of sleep mechanisms, hypocretin dysfunction, and deficit With Cataplexy symptom tetrad 1 excessive daytime sleepiness 2 cataplexy 3 sleep paralysis 4 hypnagogic hallucinations Temporary sudden loss of muscle tone, causing weakness and immobilization onset second decade of life. Without Cataplexy trigger for cataplexy: Strong emotionslaughter and anger Due To Medical Condition Nocturnal sleep-fragmented, considerable sleep disturbance is present tumors or sarcoidosis of the hypothalamus, multiple sclerosis plaques affecting the hypothalamus, paraneoplastic syndromes Treatment: scheduled naps, lifestyle adjustment, modafinil, SSRI Reference: P 2161 chap. 20 Sleep DisordersKaplan Sadocks Comprehensive Textbook of Psychiatry, 9th Edition 