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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


Whether fish sleep is an intriguing question, to the point of having inspired the .... swim continuously and do not show signs, behavioural or otherwise, of sleep.

Do fish sleep? - National Ocean Service - NOAA


Sep 16, 2014 ... The nature of fish "sleep" is an area of active research. While fish do not sleep in the same way that land mammals sleep, most fish do rest.

Do Fish Sleep? - Today I Found Out


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 ...

How Do Fish Sleep | Sleep.org by the National Sleep Foundation


Most animals sleep, and fish are no different. But how water-dwellers snooze can look really different from the way humans get their zzz's. Some differences are ...

Do Fish Sleep with Their Eyes Open? | Wonderopolis


Apr 23, 2014 ... Do fish sleep? 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 ...

Do Fish Sleep? - YouTube


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? | The Big Question


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 ...

Do fish sleep? | The Fisheries Blog


Mar 9, 2014 ... The short answer is yes; most fish do sleep. While most fish don't have eyelids, they do have a regular period of reduced activity and ...

Do Fish Sleep? - LiveScience


Oct 2, 2012 ... This puffet fish looks like it might be sleeping, and scientists tell us that yes ... Scientists have found that most fish do sleep, and as with humans, ...

Popular Q&A
Q: Do fish sleep?
A: Most fish spend time in an energy-saving state that can be called 'rest' We may call their behavior Read More »
Source: www.chacha.com
Q: Do fishes sleep?
A: Most fish spend time in an energy-saving state like "sleep", though it is probably very different! Read More »
Source: www.kgbanswers.com
Q: Do fish sleep?
A: Many fish rest or sleep during the day and are active at night but most fish do sleep. Fish can not close their eyes when they sleep. Read More »
Source: www.kgbanswers.com
Q: Do fish sleep?
A: Most all fish spend time in an energy-saving state that can be called "rest", and we might even c... Read More »
Source: www.chacha.com
Q: Do fish sleep?
A: they sleep with their eyes open since they dont have any eyelids, the find the darkest place and be still...... Read More »
Source: answers.yahoo.com