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Explore What Ancient Humans Did All Night (And What Electric Light Took) with 214 views, 2 likes, and 2 comments. Experience the impact of this video content that has captured audience attention.

For almost all of human history, the last light of the day was a fire the size of a dinner table. What did ancient humans do all night, and what did electric light take from us? This video follows one reconstructed night around a fire, built from real research on sleep, darkness and storytelling before electricity. The people in it are invented, and the studies are real. CHAPTERS 0:00 Why the night used to be different 0:34 Dusk 0:49 How dark it really was 1:16 The dark had teeth 1:49 Fire 2:29 Stories around the fire 4:03 Going to sleep 5:11 Waking at midnight 5:35 The two-sleep evidence 6:50 The night watch 7:44 Dawn 8:45 What we lost 9:57 So what did they do all night? SOURCES AND FURTHER READING - Thomas Wehr, "In short photoperiods, human sleep is biphasic" (Journal of Sleep Research, 1992) - Roger Ekirch, At Day's Close: Night in Times Past (2005) - Polly Wiessner, "Embers of society: Firelight talk among the Ju/'hoansi Bushmen" (PNAS, 2014) - Gandhi Yetish et al., sleep in three pre-industrial societies (Current Biology, 2015) - David Samson et al., sentinel-like behaviour in Hadza hunter-gatherers (Proceedings of the Royal Society B, 2017) - Kenneth Wright et al., entrainment of the human circadian clock to the natural light-dark cycle (Current Biology, 2013) - Fabio Falchi et al., "The new world atlas of artificial night sky brightness" (Science Advances, 2016) - Francesco Berna et al., evidence of fire in Wonderwerk Cave (PNAS, 2012) Some points in the video are hypotheses, not settled facts, and the video says so where it matters. If you ever wake up in the middle of the night, tell us in the comments what you do with that hour. ___________________________________________________________ #ancienthumans #sleephistory #humanevolution

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