Behavior & Breeding

Do penguins sleep standing up?

Penguins can sleep both standing up and lying down, depending on the species and circumstances. Emperor penguins often sleep standing up, especially during huddles in cold weather, using their stiff tail feathers as a tripod for balance. Other species commonly lie on their bellies to sleep, tucking their beak under a flipper. Penguins typically take many short naps throughout the day and night rather than sleeping for one long period. Research has shown that some penguins engage in microsleeps lasting just seconds, accumulating over 11 hours of sleep per day through thousands of brief naps.