These are bottlenose dolphins.
Here are some interesting Dolphin facts...
"How do Dolphins sleep?
It's not known how wild dolphins sleep, but dolphins in captivity
sleep in short cat-naps by day and night. Sometimes they sleep
floating about a foot below the surface of the water. When they need
to breathe, a stoke of the tail brings them up. A sleeping dolphin
can surface without waking, just as we can roll over. Dolphins can
also sleep while swimming. They swim slowly, rising to breathe two or
three times a minute. Their eyes may be closed or partly open. One
thing that helps support a sleeping dolphin is the layer of blubber,
or fat, beneath its skin. Blubber buoys up a dolphin and helps keep
it afloat."
An excerpt from 'The Friendly Dolphins' by Patricia Lauber
This image is now available as a t-shirt
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Royce McClure