This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep disorders and eating disorders, Subject name: Psychiatry
[{'content': 'True about NREM sleep is \nSelect and explain. \nA. Teeth grinding, B. Narcolepsy, C. Night mares, D. Sleep paralysis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bruxism is seen NREM stage 3, 4. Nightmares, Sleep paralysis are seen in REM sleep. Ref: synopsis of psychiatry, 11e, pg 538.', 'role': 'assistant'}]