Did you mean: Do Fish Sleep with Their Eyes Open?
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Sleep in fish

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 .....

Do Fish Sleep with Their Eyes Open? | Wonderopolis

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

Apr 23, 2014 ... They are sleeping, and they can sleep at any time during the day or night. Fish do sleep with their eyes open, because they don't have eyelids ...

How do fish sleep? | The Big Question

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

Mar 4, 2008 ... You can see this in a fish tank or aquarium – some float motionless in place, some float ... fishe sleep but don't close there eyes the only shut do.

www.ask.com/youtube?q=Do Fish Sleep with There Eyes Open?&v=z6pQvWZemVc
Aug 3, 2009 ... Science...the final frontier. Scientific study to see if fish do actually sleep. Evidently they do. This video is in the name of science. Don't be a ...

How Do Fish Sleep Without Closing their Eyes? » Science ABC

www.scienceabc.com/nature/animals/how-do-fish-sleep-without-even-closing-their-eyes.html

How in the name of God do fish sleep when they are surrounded by water all the time? Of course, they ... Therefore, they sleep with their eyes open! This has led ...

Why do fish not have eyelids? - The Naked Scientists

www.thenakedscientists.com/HTML/questions/question/2273/

Apr 19, 2009 ... Answer to the science question: Why don't fish have eyelids? ... How long do they sleep and how can they rest if their eyes never close?

Do Goldfish Sleep? How, when and how can you tell? | The Goldfish ...

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

Do goldfish sleep with their eyes open? Do goldfish sleep at night ... The answer is that goldfish do sleep, but not in the same way we do. Goldfish sleep is more ...

How Do Snakes Sleep With Their Eyes Open? | Animals - mom.me

animals.mom.me/snakes-sleep-eyes-open-8581.html

... their eyes open. If they are not moving, it is difficult to tell whether snakes are awake or asleep. ... Snakes have no eyelids, so they can never close their eyes or blink. Instead of ... Structure of a Fish's Eye · How Often Do Rattlesnakes Sleep ?

Why do fish sleep with their eyes open - Answers

www.answers.com/Q/Why_do_fish_sleep_with_their_eyes_open

Fish live in water, and so the eye does't need moistening, and so fish don't have eyelids. Thus they sleep with their eyes open because they have no way to ...

How do goldfish sleep? | Reference.com

www.reference.com/pets-animals/goldfish-sleep-a20aa9ec3992330b

Goldfish don't have eyelids, so when sleeping it can appear that they are just being... ... Because goldfish have no eyelids, they sleep with their eyes open.

Answer
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.
More Info

Why can't fish close their eyes, do they sleep keeping their eyes open?

www.quora.com

Jan 24, 2015 ... Yes..!!! They are sleeping, and they can sleep at any time during the day or night. Fish do sleep with their eyes open, because they don't have ...

How Do Fish Sleep | Sleep.org

sleep.org

Find out the truth about whether or not fish sleep. ... sharks are the only fish that even have them and only close them to protect their eyes during encounters with  ...

Do fish sleep? | The Fisheries Blog

thefisheriesblog.com

Mar 9, 2014 ... The short answer is yes; most fish do sleep. ... Though they are in a restful state, many fish are still acutely alert for danger – sleeping, in essence, with one eye open. ... Some parrotfish create their own “mosquito net” to sleep.