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But first, sci­ence: Turns out most hi­ber­nat­ing an­i­mals shut off their brains dur­ing a long win­ter’s snooze. No neuro ac­tiv­ity means no dream­ing—but bears don’t ac­tu­ally hi­ber­nate. Rather, they go into an ex­tended, ul­tra­slow metabolic state called “tor­por.” That means that while they drop their in­ter­nal tem­per­a­tures for the win­ter, it’s not at the ex­pense of brain waves. And that means they go into REM states. But what are they dream­ing about all win­ter? We have our the­o­ries.

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