How do marine mammals sleep underwater?

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How do marine mammals sleep underwater? How do marine mammals sleep underwater?

When marine mammals want to sleep, they can't just close their eyes and drift for the night, but have to come to the surface every now and then to get some air. They also cannot swim and sleep on the surface of the water, as this exposes them to predators and heat loss. So how […] The post How do marine mammals sleep underwater? first appeared on The Shepherd of the Hills Gazette.
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