Why Do Dolphins Sleep With One Eye Open? Dolphins have a pretty wild way of sleeping. They rest half their brain at a time—keeping one eye open for danger. Picture floating on the ocean, half awake and half dreaming. This unusual skill has a fancy name: unihemispheric slow-wave sleep. It lets dolphins stay safe and rested at the same time. Nature really thinks of everything! Follow for more fascinating insights into the unique abilities of marine life. #DolphinSleepHabits #UnihemisphericSlowWave