Drifting off to sleep

Researchers studying the resting behaviour of wild sperm whales have found evidence that whales literally 'drift' off to sleep.

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<p><a href="http://www.physorg.com/news122737263.html">Drifting off to sleep</a></p> <p>Researchers studying the resting behaviour of wild sperm whales have found evidence that whales literally 'drift' off to sleep.</p>