TIL Dolphins sleep ‘unihemispheric’. They rest one hemisphere of their brain at a time, and even sleep with one eye open. They cannot breathe unconsciously; they have to actively decide when to breathe & would drown if they slept ‘polyhemispheric’ like us.

Read more: https://us.whales.org/whales-dolphins/how-do-dolphins-sleep/#:~:text=Dolphins%20only%20close%20one%20eye,hemisphere%20sleeps%20at%20a%20time

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