You think you can sleep? This is sleep!

Science Illustrated - - CONTENTS -

The pop­u­lar prey must set­tle for pow­er­nap­ping.

Grey seal naps are among the briefest in the an­i­mal king­dom, some­times no more than 90 sec­onds, but then they take many naps dur­ing a day. The ul­tra-brief naps are of­ten taken while the seal is un­der­wa­ter, de­spite the risks.

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