Sleeping giants: Why whales don't drown when they nap ... a team of scientists from Scotland and Japan literally bumped into a group of sperm whales drifting vertically close … Individual dolphins also enter a deeper form of restfulness, often at night, a state called sleep logging.That’s because, in this state, a dolphin looks much like a log floating at the water’s surface. Researchers suggested at the time that they might be one of the world's least sleep-dependent animals. Why do whales sleep vertically? When whales are sleeping they may be observed moving slowly on the surface. How Do Whales and Dolphins Sleep? 2.1k. Close. If Miller's data is correct and sperm whales only sleep for 7 percent of their day, that makes them the least sleep-dependent mammals there are — even less than the giraffe, which sleeps for only 8 percent of its day. 96% Upvoted. Posted by 3 years ago. To answer the question regarding whether or not whales sleep (which is often asked due to the fact that whales live in water) we first need to explain what affects a whales ability to sleep when compared to land animals such as humans. The most shocking thing about this finding is just how little researchers have determined that these whales sleep. I liked this part (because I wondered how long they "sleep" like this): The whales were found to spend seven percent of their day in these vertical sleeping positions near the surface of the water, where they napped from 10 to 15 minutes. Asked by Viva Kub. At just 7% of inactivity, sperm whales may be the least sleep-dependent animal on earth. For comparison, belugas and grey whales sleep on … The sperm whale (Physeter macrocephalus) or cachalot is the largest of the toothed whales and the largest toothed predator.It is the only living member of the genus Physeter and one of three extant species in the sperm whale family, along with the pygmy sperm whale and dwarf sperm whale of the genus Kogia.. In this way the animal is never completely unconscious, but it still gets the sleep it needs. Sperm Whales sleep vertically in groups just below the surface (r/thedepthsbelow) Verified. Scientists have observed whales, dolphins, and porpoises sleep in two ways. The sperm whale is a pelagic mammal with a worldwide range, and will migrate … 29 comments. save hide report. The encounter with the sleeping whales finally explained why. Young whales sleep … They simply sleep while swimming slowly next to another animal. Archived. Sometimes, they will hang vertically suspended underwater near the surface of the ocean, which allows them to easily breach the surface and take in air when needed. share. Whales like humans are mammals and share many of the same physiological traits including … They quietly rest in the water, horizontally or vertically. Sperm whales have been seen in groups hanging vertically with their heads near the surface. Sperm Whales sleep vertically in groups just below the surface (r/thedepthsbelow) Verified. Most whales and dolphins rest hanging vertically, like the one in this video, or horizontally, a sleeping style known as “logging”. Sperm Whales Sleeping Vertically Underwater - Unusual sleep behavior in sperm whales. We need you to answer this question! ... How often do sperm whales need to breathe when sleeping? So whales and dolphins sleep by shutting down one half of their brain at a time.