Why Crafty Crocodiles May Be Sleeping With One Eye Open

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Siamese Crocodile (Photo Credit: By SuperJew CC BY-SA 3.0 via Wikimedia Commons)

While for humans the expression "sleep with one eye open" is just a metaphor to keep alert, for some animals it is a way of life. Called unihemispheric sleep, it is the ability to snooze with one eye open and the corresponding half of the brain awake, while the other half rests.

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