Whales are aquatic mammals that live in the oceans and seas across the world. They are warm-blooded animals, give birth to their offspring, and breathe air.
Whales also need sleep to survive but have you ever wondered how they sleep in the water without drowning?
Humans are involuntary breathers, who breathe automatically without thinking even while sleeping. However, whales are voluntary breathers, which means they have to think about taking each breath.
Whales have unihemispheric sleep, which allows them to partially sleep by shutting down half of their brain at one time. This lets them be aware of the surroundings as the other half is awake.
This way whales can breathe and not drown even while sleeping as one part of their brain is always awake.
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