A sleeper is predisposed to periods of apnea during which of the following non-REM sleep stag-es? 1. Stage 1 2. Stage 2 3. Stage 3 4. Stage 4
a. 1 and 2 c. 3 and 4
b. 2 and 3 d. 1 and 4
ANS: A
Non-REM stages 1 and 2 predispose individuals to apneic periods because of the reduction in respiratory drive and the fluctuations between being awake and asleep. Apnea is likely again during REM sleep because of the reduction in response to chemical and mechanical respiratory stimuli.
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