This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
NREM Sleep true is - 
Select and explain. 
A. Teeth grinding, B. Narcolepsy, C. Night mares, D. Sleep paralysis
A: Teeth grinding
Answer: A: Teeth grinding 
Explanation: Bruxism (teeth grinding) is seen during NREM sleep. All other options are disorders of REM sleep.