That people have a need for REM sleep is suggested by

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REM rebound is the phenomenon where individuals experience an increase in the amount and intensity of REM sleep following a period of REM sleep deprivation. This suggests that REM sleep serves a necessary physiological function, indicating a need for it. Option B, REM tolerance, is not a recognized phenomenon. Option C, while there can be negative consequences of REM sleep deprivation, such as mood disturbances and cognitive impairment, going "crazy" is not an accurate or scientific way to describe it. Option D, emotional catharsis during REM sleep, is a theory but does not necessarily prove that REM sleep is necessary.

That People Have a Need for REM Sleep Is Suggested