Some sea animals, like dolphins, as well as crocodiles and birds sleep with one eye open. One half of their brain is awake and the other half of their brain is resting. The animals are on the lookout for something that may harm them. It also helps them protect their babies, or simply know what is around them while they sleep.
Some sea animals, like dolphins, as well as crocodiles and birds sleep with one eye open. One half of their brain is awake and the other half of their brain is resting. The animals are on the lookout for something that may harm them. It also helps them protect their babies, or simply know what is around them while they sleep.