Kind of. Some sharks need to stay in motion at all times to keep water moving over their gills so they can breathe, and even those that don’t need to stay alert and aware of what is going on around them, so sharks can not sleep the same way that humans do. However, they still need to rest, so sharks have developed a few creative ways to get their rest while still staying active and alert in some fashion. Sharks that need to keep moving are able to sleep with only half of their brain at a time, while the other half takes care of everything else. Sharks that don’t need to keep moving often rest on the ocean floor, though even then their eyes stay open to case something yummy happens to swim by.
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