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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


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


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


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


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 ...

Do fish sleep? - Askville


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

sleep in fishes - How Fish Behave / Fish Behavior

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

Fish, however, lack the complex brain structures from where these patterns originate. Another criterion to define sleep, used mainly in the field or in situations  ...

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


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


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 ...

Some Fish Facts by Aquarium Professionals Group


Do Fish Sleep? Fish do sleep. Most fish don't have "eyelids". If the aquarium lights are left on for twenty-four hours a day, the fish will not sleep. They will become ...

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 Read More »
Source: www.chacha.com
Q: What Are Rabbits' Sleeping Habits?
A: Day Sleepers. In nature, rabbits sleep during the day. Dawn and dusk are their primary activity periods. That means the best time to play with your bunnies is e... 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
Q: What are the sleeping habits for pheasant?
A: They go up to their nests at 6:00pm to sleep. Read More »
Source: wiki.answers.com