For humans, closing their eyes is important for rest and sleep. But there are some animals that sleep with their eyes open as they have to stay protected from predators and enemies.
Here is the list - - -
1. Giraffes - - - They have to sleep standing up and open eyes to escape from predators.
2. Sharks - - - Some species have protective eyelid which helps them keep one eye open when they sleep.
3. Dolphins - - - Being marine mammals, they sleep with their eyes open and one part of the brain active.
4. Crocodiles
5. Owls - - - These nocturnal hunters sleep during the day with their eyes partially open.
6. Tree frogs - - - They sleep with their one or both the eyes open.
7. Horses - - - - They sleep only for short periods with their eyes open.
8. Fish
9. Penguins
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