Chronotype, or an individual's natural tendency towards early or late sleep, is rooted in evolutionary survival strategies. A 2017 study of the Hadza people revealed that group members were rarely all asleep simultaneously, suggesting a 'sentinel hypothesis' where staggered sleep schedules protected against predators and threats. This diversity in sleep timing, with 'morning people' acting as sentinels, has been preserved through human evolution and even inherited from archaic humans like Neanderthals and Denisovans, as indicated by genomic studies. AI
RANK_REASON The cluster discusses a scientific study published in a journal about human evolution and biology. [lever_c_demoted from research: ic=1 ai=0.1]
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