This penguin survives on 4-second microsleeps — thousands of times a day

Forty thousand winks: Chinstrap penguins survive on four second

Penguins get 11 hours of sleep a day — in four-second bouts

Nesting chinstrap penguins accrue large quantities of sleep

Penguins Take Thousands of Naps Every Day - The New York Times

Penguins nesting in a dangerous environment obtain large

Chinstrap Penguins Survive on 10,000 Four-Second Naps Every Day

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Nesting Penguins Take More Than 10,000 Mini Naps Every Day : r/nature

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Penguins snatch 11 hours of sleep through seconds-long micronaps