Fish enter an energy saving state that we could call rest or sleep, though it is not quite the same as our traditional idea of “sleep.” Many fish will hide at night and remain inactive in order to avoid being eaten; though many fish are active at night and dormant during the day instead. In answer to your question, I would say yes, fish do sleep. All fish need to enter this energy saving state, so the best thing we could consider it is “sleep.”
More or less. They have no eyelids, so it is hard to tell, but they do experience periods where they are motionless. Some fish hibernate or go dormant. The ritual is different for different kinds of fish. The parrotfish even makes a gooey sleeping bag for itself.
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