This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
Paradoxical sleep is? 
Select and explain. 
A. Seen in obstructive sleep apnea, B. REM sleep, C. NRM sleep, D. Narcolepsy
B: REM sleep
Answer: B: REM sleep 
Explanation: Ans. B REM sleepRef: Ganong, 25th ed. pg. 274* In REM sleep, the high amplitude slow waves in EEG during sleep are periodically replaced by rapid low voltage EEG activity which is identical to awake aroused state.* Now the point is that the person is sleeping while EEG record is like that of an awake patient. Hence REM sleep is called as paradoxical sleep.