Due to this limitation, dolphins sleep with their blowholes above the water surface. They also sleep with only 1/2 of their brain at a time, and take turns sleeping with different sides of their brains.
Half of the brain remains awake so that the dolphin remembers to breathe. As a result, dolphins cannot receive anesthetics or else they’ll stop breathing and whatever medical procedure they were undergoing would go to waste.
So the next time you’re at Sea World watching a dolphin show, give that guy an extra loud applause because he/she is able to do all the awesome stuff while remembering to breathe, and you probably don’t even remember where you parked your car.