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
The Non-REM (NREM) sleep is commonly associated with: 
Select and explain. 
A. Frequent dreaming, B. Frequent penile erections, C. Increased blood pressure, D. Night terrors
D: Night terrors
Answer: D: Night terrors 
Explanation: D i.e. Night terrorsNocturnal penile tumuescence occurs in REM SleepQ, it is a normal phenomenon, occurring 100 min / night Nocturnal penile tumescence & Early morning erection are used to distinguish between organic & psychogenic impotence as these are preserved in psychogenic impotenceQ.