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Card 9 / 11:
Differentiate the evolutionary theories of sleep and make a case for the one with the most compelling evidence.
One evolutionary theory of sleep holds that sleep is essential for restoration of resources that are expended during the demands of day-to-day life. A second theory proposes that our sleep patterns evolved as an adaptive response to predatory risks, which increase in darkness. The first theory has little or no empirical support, and the second theory is supported by some, though not all, research.
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