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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 typical patterns of electrical activity in the brain, including the neocortex, but fish lack ...

sleep.org/articles/do-fish-sleep

Even though they are asleep, fish are still alert for danger. And their normal sleep patterns fall by the wayside during moments like migration, spawning, or when ...

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

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 think about how  ...

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

That is, sleeping means closing your eyes and resting. The first thing we notice is that, except for sharks, most fish don't have eyelids. Also, while some ocean ...

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

Mar 9, 2014 ... While most fish don't have eyelids, they do have a regular period of ... Researchers monitored the sleep patterns of normal Zebrafish and those ...

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

Oct 2, 2012 ... Scientists have found that most fish do sleep, and as with humans, they ... Then they monitored the snooze patterns of normal zebrafish and ...

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

Goldfish don't have eyelids, so even when sleeping, their eyes always ... Some goldfish keepers see their fish floating upside down (or heavily to one side) and ...

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 ...

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 ...