Periods of REM sleep alternate with periods of non-REM sleep in a cycle that recurs about every _____________ minutes or so
A) 30-40
B) 90-100
C) 150-160
D) 210-220
Answer: B
Rationale: On a typical night, at the end of the first REM phase we cycle back toward the deep sleep stages and back into REM sleep again every 90-100 minutes.
Psychology
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