This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep Disorders, Subject name: Psychiatry
Feature of narcolepsy include (s) all except: 
Select and explain. 
A. Disorder of REM sleep regulation, B. Catalepsy, C. Hypnagogic hallucination, D. Hypnopompic hallucinations
B: Catalepsy
Answer: B: Catalepsy 
Explanation: Narcolepsy It is a disorder of REM sleep with reduced REM latency Clinical features- 4 major symptoms strong urge to fall asleep Hypnagogic and Hypnopompic hallucination Cataplexy Sleep paralysis Occurs due to deficiency of hypocretin . has strong association with HLA - DR2 Diagnosis-Polysomnography - reveals a characteristic sleep-onset REM period