Do dolphins hibernate?
A. No. In fact, they never fully sleep. When people breath, they do so involuntarily; as they sleep, they continue to breath. Dolphins, on the other hand, must swim to the surface, and then breath voluntarily. As a result, they don’t sleep like we do. It is believed that only half of their brains sleep at a time. While one half of their brains is asleep, the other half is monitoring their swimming to the surface to take a breath.
