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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.

Sleep in fish - Wikipedia

en.wikipedia.org/wiki/Sleep_in_fish

Whether fish sleep is an intriguing question, to the point of having inspired the title of several .... The brain might not be able to do this while still assailed by new stimuli and new information...

Do fish sleep?

oceanservice.noaa.gov/facts/fish-sleep.html

Sep 16, 2014 ... It all depends on what one means by sleep. Sleep is described as a period of rest in which the eyes are closed and there is little thought or ...

How Do Fish Sleep | Sleep.org

sleep.org/articles/do-fish-sleep/

A peek into nighttime at the aquarium. Most animals sleep, and fish are no different. But how water-dwellers snooze can look really different from the way ...

Do Fish Sleep with Their Eyes Open? | Wonderopolis

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

And assuming they do, HOW do fish sleep? If you've ever watched fish for any length of time, you know they get plenty of exercise. They're constantly swimming  ...

How do fish sleep? | The Big Question

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

Mar 4, 2008 ... Answer:Yes fish sleep. But it's not sleep as we know it. They don't have eyelids to close, they sometimes do it during the day, they don't show ...

www.ask.com/youtube?q=Do fish sleep?&v=55YwDntyKu0
Aug 10, 2015 ... Marine animals sleep underwater... but how?! Get 15% off http://www.domain. com's domain names and web hosting when you use coupon ...

Do Fish Sleep? - Live Science

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

Oct 2, 2012 ... They make great pets — quiet, docile, friendly enough — but do fish sleep? Scientists have found that most fish do sleep, and as with humans, ...

Where do fish sleep? - Beach Chair Scientist

beachchairscientist.com/2009/03/06/where-do-fish-sleep/

Mar 6, 2009 ... Here is an interesting adaptation – the parrotfish uses its spit to create a translucent “sleeping bag bubble” around its body while it sleeps.

Do Fish Sleep? - Today I Found Out

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

Mar 3, 2015 ... Less like sleep and more like suspended animation, most fish species do spend some time resting. And like us, if they don't put in enough ...