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
Which of the following disorders is not seen in the "REM" stage of sleep? 
Select and explain. 
A. Nightmares, B. Narcolepsy, C. Somnambulism, D. Sleep apnea
C: Somnambulism
Answer: C: Somnambulism 
Explanation: Ans. C. SomnambulismSlow wave sleep disordersa. Night terror/pavor nocturnusb. Somnambulismc. Somniloquyd. Bruxisme. Nocturnal enuresisREM (desynchronized sleep/paradoxical sleep disorder)a. Nightmaresb. Narcolepsyc. Insomniad. Sleep apnea