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www.thoughtco.com/do-sharks-sleep-2291555

Shark species that need to swim constantly to keep water moving over their gills seem to have active periods and restful periods, rather than undergoing deep sleep like we do. They seem to be “sleep swimming,” with parts of their brain less active, or "resting," while the shark remains swimming.

www.thedodo.com/do-sharks-sleep-swim-2226511159.html

The sleeping habits of sharks have always been a bit of a mystery. In order for most types of sharks to breathe, they have to be swimming, which means laying down to rest isn't possible for them. In order to sleep or take any type of rest, they would need to still be swimming while they do it. So ...

www.sharksider.com/how-do-sharks-sleep

Sharks do not experience sleep the same way humans do. Some can’t sleep at all, and the ones that do never close their eyes. Some shark species do, however, cycle through alternating periods of alert wakefulness and profound rest that is similar to sleep. We are pretty certain that sharks do not dream the way humans and some other animals do.

www.elasmo-research.org/education/topics/b_sleep.htm

How Do Sharks Swim When Asleep? In response to a question about whether or not sharks sleep and, if they do, how do they swim while unconscious, I wrote: Sleep is one of the last bastions of mystery that Science has yet to conquer. Despite several centuries of study, speculation, and debate, we still really don't know what sleep is or why we ...

www.sharksider.com/do-sharks-sleep

With our current understanding of sharks and a concrete definition of sleep, it is more than difficult to state if sharks do or do not sleep. If a side must be chosen for the purposes of this article, then the author would reside on the side that supports sharks NOT sleeping.

futuretechreport.com/how-do-sharks-whales-and-dolphins-sleep

Learn all about how do sharks, whales and dolphins sleep? Sleep is a state in which the person or animal is less responsive to outward stimuli than in a usual waking state, but to a lesser extent than in the case of hibernation (in which an animal’s metabolic rate, temperature and breathing are all significantly reduced, and external stimuli may have little or no effect) or coma (in which ...

animalstime.com/do-sharks-sleep

Ram Ventilation | Do Sharks Sleep. Biologically, sharks are not similar to other fishes in that they do not have swim bladders which may allow them to float on water. Therefore, sharks must continue to swim (just like pelagic species of sharks do) or else they will sink and descend to the bottom of the ocean.

www.thesuperfins.com/do-sharks-sleep

While the exact nature of sleep is still unknown, scientists identify the behavior in vertebrate animals as, “a reduction of activity and metabolism, and a decreased sensitivity to external stimuli.” While there are species of sharks that display aspects of this behavior, at the same time they do not display all of it. The Worst Case of ...

www.sharkwatchsa.com/en/blog/category/482/post/1099/how-white-sharks-sleep

How do white sharks sleep? Tuesday, May 01, 2012 ... While tracking tagged white sharks, ... As far as we know, white sharks do not produce noises, other than slapping their jaws. Body language has been a well documented form of communication and has identified body arching, jaw gaping, and other postures as specific social tactics. ...

animals.howstuffworks.com/fish/sharks/shark-drown2.htm

An experiment with a small shark, the spiny dogfish, indicated that swimming is coordinated by the spinal cord, not by the brain, so sharks may be able to shut down their brain and rest while still swimming [source: Martin]. Sharks in need of some rest may also take advantage of the factors that affect the amount of oxygen in the water, such as ...