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Do Fish Sleep?

Do Fish Sleep?
Most fish sleep. But is it the way we do? Well, no. Then how do fish sleep and when? Find your answer along with some other amazing facts about the sleeping habits of different animals.
Pragya T
Last Updated: Apr 1, 2019
Let us first understand what the term 'sleep' means. According to the Merriam-Webster dictionary, sleep is, 'the natural periodic suspension of consciousness during which the powers of the body are restored.'
In simple terms, it is a state of utter relaxation, where there is a temporary cessation of thoughts and ideas, and the strength of the body gets restored. Does the sleep of fish fit this definition? Or do they sleep some other way?
Fish and Sleep
Blue fish
Fish do sleep. Most fish, other than sharks, do not have eyelids. Some fish in the deep ocean never stop moving, but some of them are almost always nearly motionless. Some are active during the day and take rest at night.
Some fish are seen floating at a particular place, while others take shelter in a particular spot, like the mud or corals. Some even build a nest for resting. These fish remain alert for any sign of danger, but at the same time, are able to rest peacefully. Here are some more interesting facts on the sleeping habits of different animals.
Amazing Facts on Sleeping Habits of Animals
Baby cobra
Snakes sleep with their eyes open as they don't have eyelids.
Asian Elephant baby takes a nap
Elephants stand during their non-REM sleep, but lie down for the REM sleep (the stage of sleep when dreams occur).
Crocodile On Rock
Crocodiles sleep with their mouths open.
Sleeping lion
Large animals like lions which are carnivorous and feed on other animals, can afford to sleep for long periods (as much as 17 hours), because they are rarely in danger.
Bird looking
Birds dream about singing, while they are asleep.
albatross flying over the sea
Albatrosses can sleep while they are flying.
Sleeping Fox
A red fox is warm and snuggles in its own fuzzy coat.
Roman Snail on piece of wood
A snail, on an average, can sleep for a period of 3 years!
Koala hugging a tree
A koala can sleep up to 22 hours in a day, which is almost the whole day.
Sleeping Baby Giraffe
On the other hand, a giraffe sleeps for less than 2 hours in a day.
  • Another lazy sleeping animal is the sloth, which sleeps for around 20 hours of the day.
  • Some animals can tuck themselves even in a bed of cold snow.
  • Cockroaches sleep for a period of 14 hours. If they are deprived of this, they make up for their sleeping hours the next day.