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
In narcolepsy, the polysomnographic recording typically shows which of the following patterns? 
Select and explain. 
A. REM intrusion during inappropriate periods, B. An absence of REM sleep in midcycle, C. Spike-and-wave EEG recording, D. Extreme muscular relaxation
A: REM intrusion during inappropriate periods
Answer: A: REM intrusion during inappropriate periods 
Explanation: REM intrusion during inappropriate periods