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Fish generally go into an energy saving mode of "rest" but do not "sleep" in the same way land animals do.
Since they do not have eyelids, they sleep with their eyes open.

en.wikipedia.org/wiki/Sleep_in_fish

Whether fish sleep is an intriguing question, to the point of having inspired the title of several popular science books. In birds and mammals, sleep is defined by eye closure and the presence of typical patterns of electrical activity in the brain, including the neocortex, but fish lack ...

sleep.org/articles/do-fish-sleep

Even though they are asleep, fish are still alert for danger. And their normal sleep patterns fall by the wayside during moments like migration, spawning, or when ...

thefisheriesblog.com/2014/03/09/do-fish-sleep

Mar 9, 2014 ... While most fish don't have eyelids, they do have a regular period of ... Researchers monitored the sleep patterns of normal Zebrafish and those ...

www.todayifoundout.com/index.php/2015/03/fish-sleep

Mar 3, 2015 ... Less like sleep and more like suspended animation, most fish ... closed eyelids and a particular brainwave pattern in the neocortex; as a result, ...

wonderopolis.org/wonder/do-fish-sleep-with-their-eyes-open

Think about your sleep habits and how they might appear to a fish. You might think it's weird how fish sleep, so what do you believe fish would think about how  ...

bigquestion.wordpress.com/2008/03/04/how-do-fish-sleep

Mar 4, 2008 ... They don't have eyelids to close, they sometimes do it during the day, they don't show the characteristic brainwave patterns like REM sleep ...

www.howfishbehave.ca/pdf/sleep%20in%20fishes.pdf

Most sleep researchers, being focused on mammals, recognise sleep when they see distinctive patterns of electrical activity of the brain. Fish, however, lack the.

www.livescience.com/32162-do-fish-sleep.html

Oct 2, 2012 ... Scientists have found that most fish do sleep, and as with humans, they ... Then they monitored the snooze patterns of normal zebrafish and ...

australianmuseum.net.au/do-fishes-sleep

Oct 8, 2012 ... In humans, the transition to sleep (or even closing the eyes) involves specified changes in the pattern of brain waves in the area of the brain ...