Sharks are a kind of fish, they are a very fierce fish, other small fish are their food. One of the more interesting questions in shark research is whether they sleep. In previous studies, researchers have tended to think that sharks don't sleep because they swim as if they don't need rest. However, with the progress of science and technology, researchers have gradually found that sharks still rest, not as they have always believed that they do not need to sleep.
However, the way sharks sleep is not the way we generally perceive it, and it is different from the way other animals sleep, including humans. When a shark sleeps, only one of the left and right hemispheres is resting. That is, while the shark's left hemisphere rests, its right hemisphere keeps working; While the right hemisphere is resting, the left hemisphere is working. This allows the left and right hemispheres of the brain to alternate rest, and they can continue to move while they sleep. Because sharks don't have eyelids, we can't tell from their appearance that they are sleeping, as if they are always active.
As mentioned above, sharks will sleep. Sharks generally have a certain amount of time to sleep, just like other animals'biological clocks. Some of the more common shark species, such as white tip shark, tiger shark, great white shark and so on, will sleep during the day and come out at night.
