Migratory birds take hundreds of naps as they fly; they also practice unilateral eye closure, in which one eye closes, thereby permitting half the brain to sleep. | Harper's Magazine

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Migratory birds take hundreds of naps as they fly; they also practice unilateral eye closure, in which one eye closes, thereby permitting half the brain to sleep.

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Migratory birds take hundreds of naps as they fly; they also practice unilateral eye closure, in which one eye closes, thereby permitting half the brain to sleep.

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