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en.wikipedia.org/wiki/Whale

Whales are a widely distributed and diverse group of fully aquatic placental marine mammals. .... Whales do not form a clade or order; the infraorder Cetacea includes dolphins and porpoises, which are not considered whales. ..... A 2008 study found that sperm whales sleep in vertical postures just under the surface in  ...

www.scientificamerican.com/article/how-do-whales-and-dolphin

Marine mammals such as whales and dolphins spend their entire lives at sea. So how can they sleep and not drown? Observations of bottlenose dolphins in ...

www.huffingtonpost.com/2014/10/11/humpback-whale-sleep-video_n_5970296.html

Oct 11, 2014 ... A group of underwater photographers known as Panga MX says it captured rare footage of the majestic marine mammal snoozing earlier this ...

www.whalefacts.org/do-whales-sleep

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 ...

animals.howstuffworks.com/mammals/question643.htm

Whales and dolphins are mammals, so in a lot of ways, they are just like human beings. Among other things, they have similar bone structure, are warm-blooded  ...

www.thoughtco.com/do-whales-sleep-2291509

Whales don't sleep the same way as humans, they have to think about every breath they take and only rest one-half of the brain at a time.

www.eaglewingtours.com/this-is-how-killer-whales-sleep-without-drowning

Aug 25, 2014 ... So the big question is: How do killer whales sleep without dying? ... Dolphins and beluga whales sleep by shutting down one hemisphere of ...

www.ask.com/youtube?q=Do+Whales+Sleep%3F&v=G_PmedKLbLI
Jul 7, 2009 ... Whales sleep by only allowing half of their brain to rest at a time so that they may look out for danger and breath air at the surface of the water.

www.mnn.com/earth-matters/animals/photos/weirde-sleep-habits-animal-world/sperm-whales

Mar 2, 2017 ... 16 weird sleep habits in the animal world ... Based on this, researchers believe sperm whales do sleep fully while drifting for 10 to 15 minutes at ...