Why do Dolphins and Whales sleep with one eye open?
Do fish sleep?\xa0How can sea\xa0creatures sleep if they have no eyelids?\xa0How do marine mammals breathe while they sleep? For free home activities sign-up at www.WhoSmarted.com\nSee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.