Slow-wave sleep seems to play a particularly important role in the recuperative effects of sleep. The following is major evidence for this conclusion:

Question

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Option A states that people regain only a small portion of their lost sleep following a period of sleep deprivation, but they regain much of their lost stage 4, which suggests that slow-wave sleep plays an important role in recuperative effects. Option C states that volunteers who have reduced the amount that they sleep each night have often accomplished this without substantially reducing the amount of stages 3 and 4 sleep, which also suggests the importance of slow-wave sleep. Option B is not as strongly related to the recuperative effects of sleep as the other options. Therefore, E is the best choice because it includes options A and C, both of which provide strong evidence for the importance of slow-wave sleep in the recuperative effects of sleep.

Slow-Wave Sleep Seems to Play a Particularly Important Role in the Recuperative