The Invention of the Light Bulb Fundamentally Changed Our Biology

For centuries, humans slept in segments. They would go to bed around 9:00 p.m. or 10:00 p.m., sleep for three to four hours, and wake up after midnight for an hour or so. During that time they might pray, meditate, have sex, or even perform simple chores that didn’t require much illumination or skill. Then they would go back to sleep for another three to four hours, finally getting up around dawn. This strange sleep pattern wasn’t the result of insomnia, it was what’s known as biphasic sleep.

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