On the other side of the aisle are evolutionary psychologists and cross-cultural sociologists, who point out that the American habit of sleeping sepa… - Thomas Lewis

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On the other side of the aisle are evolutionary psychologists and cross-cultural sociologists, who point out that the American habit of sleeping separately is a global and historical singularity. Almost all the world’s parents sleep with their children, and until the last sliver of human history, separate sleep was surpassingly rare. The burden of proof thus falls upon our culture to justify its anomalous nighttime practices.