Do blue whales sleep?
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Unlike whales we do not have to consistently fear drowning or worry about coming up for air when we go to sleep and we usually only become aware of our breathing when we are swimming or running to exhaustion. read more
Source: whalefacts.org
Observations of bottlenose dolphins in aquariums and zoos, and of whales and dolphins in the wild, show two basic methods of sleeping: they either rest quietly in the water, vertically or horizontally, or sleep while swimming slowly next to another animal. read more
Source: scientificamerican.com
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Source: kottke.org