The adorable penguin turns out to be a true sleeping champion. According to a recent study, this polar animal can sleep for up to 11 hours a day. But it doesn’t happen all at once—instead, they rest in tiny bursts, each lasting around four seconds.
In 2014, behavioral ecologist Won Young Leen noticed something unusual in Antarctica. Penguins would doze off for just a moment, then wake up again. He had never seen them sleep for long stretches.
By 2019, researchers returned to Antarctica to investigate further. They attached electrodes to 14 penguins from a breeding colony to measure brain activity, movement, and body position. They also filmed the birds over an 11-day observation period.
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The Longest Nap: 34 Seconds
Each day, the birds took an average of 10,000 micro-naps, each lasting roughly four seconds. The longest recorded nap was just 34 seconds.
“We’ve never seen such sustained [sleep] fragmentation in any other species,” said study co-author Paul-Antoine Libourel.
It was also discovered that penguin sleep duration varies depending on circumstances—whether they are incubating eggs or hunting at sea. Penguins share duties between guarding the eggs and foraging. The parent sitting on the egg sleeps shorter and more frequently, while the one hunting sleeps less overall but can micro-nap while floating in the water.
Researchers believe this sleeping pattern may be a survival mechanism to protect their developing eggs, allowing for constant vigilance in the midst of a noisy colony of 27,000 penguins and potential predators. Some suggest that the noisy, bustling environment itself makes it impossible for penguins to sleep for longer stretches. (Sulung Prasetyo)
