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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

en.wikipedia.org/wiki/Sleep_in_fish

Sleep can be defined in birds and mammals by eye closure and typical electrical patterns in the neocortex, but fish lack eyelids and a neocortex. Yet this oscar is ...

Do fish sleep? | The Fisheries Blog

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

Mar 9, 2014 ... The short answer is yes; most fish do sleep. ... Researchers monitored the sleep patterns of normal Zebrafish and those that lacked a functional ...

How do fish sleep? | The Big Question

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 ...

Do Fish Sleep with Their Eyes Open? | Wonderopolis

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

Apr 23, 2014 ... 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 ...

Sleep in fishes - howfishbehave.ca

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

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

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

The answer to the question “do goldfish sleep?” is one of the most common things new goldfish keepers want to know about their fish.

Do Fish Sleep? - PetPlace.com

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

Jun 15, 2015 ... It is believed that fish sleep, although it is a controversial subject; some ... One of the favorite habits of the clown loach, which has alarmed most ...

www.ask.com/youtube?q=Sleeping Habits of Fish&v=GemJIEO9AFw
Mar 16, 2012 ... My angelfish that I've had for three years has done this every night.

Do fish sleep? - Askville

askville.amazon.com/fish-sleep/AnswerViewer.do?requestId=1531101

Scientists have also measured their brainwaves and do not find visible sleep patterns. But, some fish do noticibly slow down, or stop their ...

Popular Q&A
Q: What are the sleeping habits of fish.
A: Fish don't really "sleep," they just go inactive for a while. Their eyes are open and they float around in the Read More »
Source: www.chacha.com
Q: What do goldfish usually do when they sleep? Fish. /. Goldfish sl...
A: Hi Bela, I'm sorry you lost your fish!  The other one, from what you describe, seems to be acting normally, though.  Goldfish don't actually sleep in the way th... Read More »
Source: en.allexperts.com
Q: What Are Rabbits' Sleeping Habits?
A: As prey animals, rabbits are in constant danger of becoming predator snacks. Your pet rabbit's sleeping habits don't differ significantly from his wild ancestor... Read More »
Source: www.ehow.com
Q: What Are Recommended Sleeping Habits?
A: Have a particular time that you wake up and go to sleep. It is tempting to stay up late and sleep in on the weekends, but this has a negative effect on your sle... Read More »
Source: www.ehow.com
Q: What are the habits of fish?
A: swiming and swiming and swiming. Read More »
Source: wiki.answers.com