Fish do sleep, but not by human standards. Specifically, they enter into a state of rest which serves a similar purpose as sleep. Instead of going unconscious and entering into various stages of sleep like humans, fish usually float in one place or rest on a stable surface (e.g. coral, sea bottom, etc.) and enter an energy-saving, restorative state. In this state, fish will become less aware of their surroundings and their metabolism will slow. Interestingly, research has shown that fish exhibit symptoms of sleep-deprivation if they do not get enough rest.
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