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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 ...

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 ...

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

Fish do sleep with their eyes open, because they don't have eyelids (except for some ... What other things about human sleep habits might fish find peculiar?

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, ...

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.seafriends.org.nz/indepth/sleeping_fish.htm

Swhowing how fish sleep and how some are nocturnal. ... Perhaps they relax their bodies and their skins, and the colours and patterns that then appear, are ...

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

It therefore makes sense for your goldfish to follow a similar pattern to your own ... Some goldfish keepers see their fish floating upside down (or heavily to one ...