Penguins snatch 11 hours of sleep through seconds-long micro

In humans, nodding off for a few seconds is a clear sign of insufficient sleep -- and can be dangerous in some situations, such as when driving a car.

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Christian Harding , Vladyslav Vyazovskiy , Atlantic Ocean , Paul Antoine Libourel , Lyon Neuroscience Research Centre , Antarctic Peninsula , South Atlantic Ocean , King George Island ,