How Electric Light Changed the Night (And The Way We Sleep)

About 18 months ago, we ran a story entitled How Our Ancestors Used to Sleep Twice a Night and Highlighting the Problem of Present Shock. The author, Jeremy D. Johnson, informed us that, “8 hour sleeping is a modern invention” and in the 18th Century “we slept twice a night, getting up for an hour or two for recreation before heading back to bed until dawn.” Now San Francisco’s public television station KQED has produced a short film laying the blame on artificial light:


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