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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.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.

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  ...

australianmuseum.net.au/do-fishes-sleep

Oct 8, 2012 ... Deciding if a fish is asleep depends on many factors, one of which is the definition of ... So, as far as brain-wave patterns go, fishes don't sleep.

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 ...

thegoldfishtank.com/goldfish-info/facts/do-goldfish-sleep

You'll notice that your goldfish don't close their eyes when they sleep. ... Some goldfish keepers see their fish floating upside down (or heavily to one side) and ...

www.petplace.com/article/fish/general/understanding-your-fish/do-fish-sleep

3 days ago ... Strange Fish Habits for Sleep. Some types of fish exhibit odd sleep behaviors. The parrotfish sleeps inside a shield made of mucus that it ...