Marine animals sleep underwater... but how?!
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What Your Sleeping Style Says About You ???? http://dne.ws/1Nfeu66
Animal sleep: a review of sleep duration across phylogeny.
"Sleep duration and placement within the twenty-four hour day have been primary indices utilized in the examination of sleep function. It is of value, therefore, to evaluate these variables in a wide range of animal species."
How do whales and dolphins sleep without drowning?
"Marine mammals such as whales and dolphins spend their entire lives at sea. So how can they sleep and not drown? 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."
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