These nesting penguins nod off over 10,000 times a day, for seconds at a time

Micronaps net chinstrap penguins over 11 hours of sleep a day and let them watch for predators

A solitary black and white chinstrap penguin sits on rocks on an island near Antarctica.

A chinstrap penguin (Pygoscelis antarcticus) gets a few precious seconds of shut-eye on King George Island off the coast of Antarctica.

W.Y. Lee

Nesting chinstrap penguins take nodding off to the extreme. The birds briefly dip into a slumber many thousands of times per day, sleeping for only seconds at a time.