How do whales sleep?

Nena had yet another cool idea for our March #SciCommChall “science on the breakfast table” and she created the graphic below that would be amazing on, for example, a box of corn flakes. She writes:

The sleeping behaviour of whales and dolphins is fascinating and different in every specie. We want to present you amazing facts about how marine mammals sleep and how it works.
Very special in all of them is their ability of an active regulation of breathing. Humans breathe automatically, whales can control their breath. How they deal with them during sleeping varied from whale to whale.

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