Dolphins have a clever trick that doesn’t involve jumping in the air for fish: They can overcome sleep deprivation and remain constantly vigilant for days at a time by resting one half of their brain while the other half remains conscious.

Because they need to periodically come up for air and keep an eye out for potential predators, dolphins can’t curl up and zonk out at night like land mammals can. So they must stay somewhat conscious and sleep with the proverbial one eye open.

Handmade Kombologia