Do you know Dolphin sleeps with one eye open?

 Dolphins only closes their one eye and opens another one when sleep. The left eye of dolphin closed whereas the right eye of the dolphins keep partially open because the half of the brain sleeps at one time and half of the brain works and vice-versa. This also help dolphin to avoid from being eaten by big whales and allow them to continuously get air when they sleeps.

                                                                

                                                                   Thank You