3 ms·

I have also read a study (can find a link if somebody wants it) that observed bushmen in the kalahari (or somewhere like that - mostly untouched by modern civil

I have also read a study (can find a link if somebody wants it) that observed bushmen in the kalahari (or somewhere like that - mostly untouched by modern civilisation) and found that the distribution of sleeping patterns (i.e. night owls vs early birds) was pretty uniform. They also found that because of this, there was always somebody in the tribe who was awake at any given point. They theorised an evolutionary advantage to this in that there is always somebody awake to keep watch.

privong 7y ago
A similar evolutionary argument was put forward in "Why We Sleep"[0] by Matthew Walker. Its mention in the book was less specific, so I'm not sure if it's referring to the same study. [0] https://en.wikipedia.org/wiki/Why_We_Sleep https://en.wikipedia.org/wiki/Why_We_Sleep
jhncls 7y ago
Maybe you are referring to David Samson's study of the Hadza tribe in Northern Tanzania? "Chronotype Variation Drives Nighttime Sentinel-Like Behaviour in Hunter-Gatherers", 2017. [0] Or in some more entertaining format at Duke University's website [1]. [0] http://dx.doi.org/10.1098/rspb.2017.0967 http://dx.doi.org/10.1098/rspb.2017.0967. [1] https://today.duke.edu/2017/07/live-grandparents-helped-human-ancestors-get-safer-night%E2%80%99s-sleep https://today.duke.edu/2017/07/live-grandparents-helped-huma...