What Did Ancient Humans Do at Night? | History Teacher Reacts | Zenn
April 21, 2026
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20:50Now PlayingWhat Did Ancient Humans Do at Night? | History Teacher Reacts | Zenn
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Zenn @Zenn0009 explores how the invention of artificial light fundamentally altered human biology and culture, which for 99.9% of history were shaped by near-total darkness. Before electric lights, the introduction of fire extended the human day by several hours, creating a "circle of safety" that allowed for the birth of culture through storytelling and social bonding around campfires. Historically, humans did not sleep in one continuous block but followed a biphasic pattern consisting of a "first sleep" and a "second sleep," separated by a period of quiet, meditative wakefulness used for reflection or socializing. Modern science has confirmed this natural rhythm, showing that our brains produce high levels of prolactin during this midnight gap, a state of consciousness largely lost to us today due to artificial light's suppression of melatonin. The video concludes that what we now call insomnia may actually be our bodies attempting to return to this ancient, 300,000-year-old biological program. Mr. Terry shares his thoughts.
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