Dolphins too. Half of their brain keeps them swimming while the other half sleeps. Other fun fact: Humans making long car drives also do what's called "microsl

Dolphins too. Half of their brain keeps them swimming while the other half sleeps. Other fun fact: Humans making long car drives also do what's called "microsleeping". Your eyes remain open and your hands stay on the wheel, but your brain goes unconscious for a couple seconds at a time. Usually, you don't even notice…