The sperm whale may reach up to 20.5 metres (67 ft), with the head representing up to one-third of the animal’s length. For food (squid mainly), the sperm whale plunges to 2,250 metres (7,380 ft), making it the second deepest diving mammal, following only the Cuvier’s beaked whale.
So how do these huge sea animals sleep? Surprisingly they do their “dreaming” in a vertical position, which is a quite awesome sight considering how big they are. It is like a scene from a sci-fi movie.