夜中に目が覚めるのは「睡眠障害」ではなかった｜人類進化の真実

Waking up in the middle of the night for no reason. Still feeling tired in the morning. This doesn't mean your sleep is broken. In fact, humans are not designed to sleep completely. A study tracked 33 members of the Hadza tribe, who still live a hunter-gatherer lifestyle in the African savanna, for 20 days. The total time they were all in deep sleep simultaneously was only 18 minutes. Why do humans sleep this way? The answer lies in the moment humans descended from trees to the ground millions of years ago. -------------------------------------------------- 【What you will learn from this video】 • Why human sleep is fundamentally different from other primates • The "Sentinel Hypothesis" revealed by Hadza sleep research • Why waking up in the middle of the night is evidence of evolution • The real reason why modern people can't sleep -------------------------------------------------- 【References】 • Samson, D.R., Nunn, C.L. et al. (2017). "Chronotype variation drives night-time sentinel-like behaviour in hunter–gatherers." Proceedings of the Royal Society B, 284(1858). — 20-day sleep observation of the Hadza people, 18 minutes of simultaneous sleep - evidence for the Sentinel Hypothesis • Nunn, C.L., Samson, D.R., Krystal, A.D. (2016). "Shining evolutionary light on human sleep and sleep disorders." Evolution, Medicine, and Public Health, 2016(1), 227–243. — Evidence for humans having the shortest sleep time and highest REM ratio among primates • Samson, D.R., Nunn, C.L. (2018). "Sleep in a comparative context." American Journal of Physical Anthropology, 166(3), 601–612. — Evidence for human sleep being 36 percent shorter than predicted, based on a comparison of 30 primates • Suraci, J.P. et al. (2019). "Fear of the human 'super predator' pervades the life history strategies of small and large carnivores." Proceedings of the Royal Society B. — Evidence for the cougar experiment (fleeing at the sound of human voices), University of California, Santa Cruz • Kimura, Moritake (1994). "The Valley of Lamentation: A Terrifying Documentary of the Man-Eating Brown Bear of Tomamae-Sankebetsu," Kyodo Bunka-sha — Detailed record of the Sankebetsu Brown Bear Incident (1915) • Japanese Wikipedia entries for "Jishinban" and "Tsujiban" (Reference) — Overview of the night watch system in the Edo period -------------------------------------------------- #HumanEvolution #SecretsOfSleep #MysteriesOfHumanity #EvolutionaryTheory #Anthropology #Trivia #SleepDisorders #SlowExplanation #Culture #SecretsOfHumanity