Dolphins Can Sleep One-Half of Their Brain at a Time

Dolphins Can Sleep One-Half of Their Brain at a Time

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Scientists from the United States have learned that dolphins are able to stay alert and active for 15 days or more at a time by sleeping only one-half of their brain. The experts believe that this ability to stay alert by using only half of their brain is a key to the survival of sea mammals. The scientists believe that the ability helps the dolphin to surface to breathe and remain vigilant for predators such as sharks.