Multiple Choice
Sleepwalking occurs in stage __________ sleep, whereas nightmares occur in stage __________ sleep.
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5. Consciousness and Sleep
Sleep
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Which of the following statements about REM sleep during the course of a typical night's sleep is accurate?
A
REM sleep occurs only in the first sleep cycle of the night.
B
REM sleep and non-REM sleep alternate at random throughout the night.
C
The proportion of REM sleep in each cycle increases as the night progresses.
D
The proportion of REM sleep in each cycle decreases as the night progresses.
Verified step by step guidance1
Understand the structure of a typical night's sleep, which is divided into multiple sleep cycles, each lasting about 90 minutes and consisting of both non-REM and REM sleep stages.
Recognize that REM sleep does not occur only in the first cycle; instead, it appears in every cycle but varies in duration.
Know that REM and non-REM sleep do not alternate randomly; they follow a predictable pattern within each cycle.
Recall that as the night progresses, the duration of REM sleep within each cycle tends to increase, while the duration of deep non-REM sleep decreases.
Conclude that the accurate statement is that the proportion of REM sleep in each cycle increases as the night progresses.
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