Dolphins have a strange way of resting—they sleep with one eye open. Dolphins are conscious breathers, meaning that they have to stay awake to breathe; if they went into an unconscious or total sleep state, they would drown. So not only do they sleep with one eye open, only half of their brain goes to sleep at any one time. It’s a strange sight to see—a dolphin will float to the surface of the water, flip on one side and and go to sleep, keeping the eye that is under water open. Then throughout their sleep they alternate sides, flipping over and opening the other eye. Not only does having an eye open and half their brain awake keep them from drowning, it also allows them to constantly watch out for predators.
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