40.
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23년 7월 모의고사
23년 7월 모의고사
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40.
As a social species, should we not all be synchronized and therefore awake at the same time to promote maximal human interactions? Perhaps not. Humans likely evolved to co-sleep as families or even whole tribes, not alone or as couples. Appreciating this evolutionary context, the benefits of such genetically programmed variation in sleep/wake timing preferences can be understood. The night people in the group would not be going to sleep until one or two a.m., and not waking until nine or ten a.m. The morning people, on the other hand, would have retired for the night at nine p.m. and woken at five a.m. Consequently, the group as a whole is only collectively vulnerable (i.e., every person asleep) for just four rather than eight hours, despite everyone still getting the chance for eight hours of sleep. That's potentially a 50 percent increase in survival fitness. Mother Nature would never pass on a biological trait - here, the useful variability in when individuals within a collective tribe go to sleep and wake up - that could enhance the survival safety and thus fitness of a species by this amount. And so she hasn't.
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