Which statement 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. Stage 3 of slow-wave sleep mostly occurs in the early morning hours.
Answer: C
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