It's been rumored that sharks don't sleep at all; the fact some sharks must stay on the move to facilitate their breathing has contributed to this idea.
Two sleep phases are well known in birds and mammals, and
So the team investigated signs of sleep in the draughtsboard shark , which they'd previously discovered are nocturnal animals., the researchers demonstrated it took greater electric stimulation for a shark to respond when the animal appeared to be resting – but they did not confirm this resting state was sleep.
"Not only do sleeping sharks have reduced responsiveness to stimulation, they also have lower metabolic rate," Kelly and teamThe sharks closed their eyes while asleep more commonly during the day – suggesting that eye closure is more likely associated with external factors like the presence of light, rather than the sleep state itself. During the night, 38 percent of sharks kept their eyes open, even while other indicators suggested they were sound asleep.
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