Which of the following statements is true of progressive cycles during sleep?
A. Non-REM sleep involves active dreaming, and REM sleep involves deep, unconscious sleep.
B. With each progressive cycle, the non-REM periods are longer and the REM periods shorter.
C. Non-REM sleep lasts for only about 8-10 minutes, and REM sleep lasts for 90 minutes.
D. With each progressive cycle, the non-REM periods are shorter and the REM periods longer.
Answer: D
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