How Do Fish Sleep Without Closing Their Eyes?

Fish don’t need to close their eyes to sleep. They just stop moving and rest in a quiet place, like a cozy bed underwater. Some fish even change color or slow down their breathing to show they are sleeping.

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Examples

A goldfish floats gently near the top of its bowl while it sleeps.
A shark stops swimming and stays still at the bottom of the ocean.
A fish hides among rocks and barely moves during the day.

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Categories: Biology · fish,sleep,biology,aquatic life