Because of the effects of depriving research subjects of either REM sleep or stages 3 and 4 NREM deep sleep, it seems clear that:

Question

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The effects of depriving research subjects of either REM sleep or stages 3 and 4 NREM deep sleep indicate that we need to experience the full range of NREM sleep stages and REM sleep. Therefore, option A is the best choice. Option B is incorrect because both NREM and REM sleep have been found to be necessary components of sleep. Option C is incorrect because both stages of sleep are necessary. Option D is incorrect because both stages of sleep are necessary.

Because of the Effects of Depriving Research Subjects of Either