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the control of fire by early humans a million years ago changed our sleeping patterns. Exposure to artificial light during the afternoon altered humans circadian rhythms and contributed to a longer waking day, giving us 16 hours in the waking day while most mammals are only awake for half that.

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Fun Fact: the control of fire by early humans a million years ago changed our sleeping patterns. Exposure to artificial light during the afternoon altered humans’ circadian rhythms and contributed to a longer waking day, giving us 16 hours in the waking day while most mammals are only awake for half that.

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