MCAT Behavioral Sciences Question 51: Answer and Explanation
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Question: 51
6. Which of the following indicates the pattern of sleep stages during a complete sleep cycle early in the night?
- A. 1–2–3–4–1–2–REM
- B. 1–2–3–4–3–2–REM
- C. 4–3–2–1–2–3–REM
- D. 4–3–2–2–3–1–REM
Correct Answer: B
Explanation:
Early in the evening, sleep cycles include deepening of sleep (Stages 1–2–3–4), followed by lightening of sleep (Stages 4–3–2) and then REM. Later in the evening, the cycle may be shortened as slow-wave sleep becomes less common.