Asked in Whales
Whales

If whales are mammals how come they can sleep under water and we can't?

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Wiki User
08/30/2013

Science isn't entirely clear on this. One option is that they're simply able to hold their breath long enough to get a useful nap between breaths. Another is that they somehow sleep with one half of the brain at a time, leaving the other half awake to sort out basic functions like breathing without drowning.