A dolphin's sleeping behavior differs significantly from ordinary human sleep. Their unusual sleep pattern reflects the demands of living in an aquatic environment. The exact sleeping behavior varies according to https://scholar.google.com/citations?hl=en&view_op=list_works&gmla=AERr9JGRFvWXMeqdvnaJwrsnAe3ekQAbHvLSwWzaZn67W8oNut_BeMJGeb9655LoVhcLvHC50tK1rHfbEiB9Jg&user=BMX-IjcAAAAJ