Dolphins Sleep With One Eye Open and Half Their Brain Awake

This "unihemispheric slow-wave sleep" allows them to remain vigilant for predators and surface for air while resting. Their active brain half ensures they don't drown or become vulnerable, demonstrating remarkable evolutionary adaptation.

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https://en.wikipedia.org/wiki/Unihemispheric_slow-wave_sleep

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Published: March 26, 2026
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Biology Ocean Animals Marine Life Weird Brain Adaptation Dolphin Sleep Unihemispheric Sleep Mammals

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