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
Maximum duration of sleep is spent in 
Select and explain. 
A. NREM 1, B. NREM 2, C. NREM 3, D. REM
B: NREM 2
Answer: B: NREM 2 
Explanation: Maximum duration is spent in NREM 2.