Dolphins shut down half of their brains when they sleep.
Scientists hooked electrodes to dolphins' heads (this is called electronography). That way they could monitor their brain activity throughout the day. What they found: rather than sleeping the way we do, they spend 8 hours every day with half of their brains shut down. They just float around semi-consciously.
Dolphins are "conscious breathers". That is, they need to think about every time that they breathe. If they went fully into sleep like we do, they wouldn't be able to breathe, and they would die.
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