Which of the following is true of the sleep cycle during a night of sleep?
A) Each non-REM/REM cycle lasts about 45 minutes.
B) Subjects first enter REM sleep and then transition to non-REM sleep.
C) As the night goes on, the relative length of REM sleep increases in each successive cycle.
D) Stages 3 and 4 of slow-wave sleep mostly occur in the early morning hours.
E) Sleep cycles are random across the night.
Answer: C
Rationale: As the night goes on, the relative length of REM sleep increases in each successive cycle.
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