Monday, May 7, 2007

Can Whales Get A Good Night's Sleep?

Unlike most animals, whales are conscious breathers. All mammals sleep, but whales cannot afford to become unconscious for long because they may drown. It is thought that only one hemisphere of the whale's brain sleeps at a time, so they rest but are never completely asleep.

If they can't really sleep, does that mean whales don't dream?

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