The art of nodding off appears to have been mastered by breeding chinstrap penguins, who take more than 10,000 naps a day, with each nap lasting an average of four seconds, according to a new study.

Have you tried napping with your eyes open? Chinstrap penguins have mastered the art! These sleep-deprived dads (and moms!) take thousands of 4-second naps a day to keep their chicks safe.