The best indication that dreaming serves as a necessary biological function is provided by the fact that

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Most mammals experience REM rebound, which means that they increase the amount of time spent in REM sleep following a period of REM sleep deprivation. This suggests that REM sleep is necessary for some biological function, and that the body will prioritize it by making up for lost REM sleep. This is the strongest indication that dreaming serves as a necessary biological function.

The Best Indication That Dreaming Serves as a Necessary Biological