Which of the Following Is True of Human Sleep Cycles

question 49

Multiple Choice

Which of the following is true of human sleep cycles?

• A) Sleep cycles are random across the night.
• 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) Each non-REM/REM cycle lasts about 45 minutes.

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