In general, fish do not sleep in the same way that humans or other animals might; they tend to just rest. Some of them do this on a diurnal/nocturnal cycle – they’ll be active during the day and resting at night, or vice versa.
There is some question about whether sharks sleep or not. There are reports of sharks resting motionless in caves, but their eyes may still actively follow divers – which means they are probably not sleeping. They may be able to shut down different lobes of their brain in sequence, so that while one lobe is resting the others are active – this is what dolphins do. Research on the subject is currently inconclusive.
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