Sleep stages 1–4 are termed ________, whereas stages 3–4 are referred to as ________
A) REM sleep; non-REM sleep
B) non-REM sleep; slow-wave sleep
C) slow-wave sleep; non-REM sleep
D) paradoxical sleep; REM sleep
E) arrhythmic sleep; paradoxical sleep
Answer: B
Rationale: Sleep stages 1–4 are termed non-REM sleep, whereas stages 3–4 are referred to slow-wave sleep.
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