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iza · 3138 days ago · link · · parent · post: Why We Sleep Badly on Our First Night in a New Place - The Atlantic
I heard someone talking about this on the radio earlier. She explained an experiment they did with birds where they had them all sleep in a line. The ones in the middle slept with both sides of the brain but the ones on the ends only slept with half (the side facing the other birds), presumably to stay alert for predators.