At first glance, it looks like the scene of an accident.

A sea turtle has plunged headfirst into a giant marine sponge. Its shell tilts upward, and its rear flippers stick out into the water. It isn’t moving. To anyone unfamiliar with the strange sleeping habits of sea turtles, the animal looks decidedly dead.

But there’s no emergency here. The turtle is just having a very good nap.

“I can assure you they[‘re] perfectly fine,” Oliver Richardson, a dive instructor at Quo Vadis Dive Resort in Moalboal, Philippines, wrote on Instagram. “They just love this spot for a nap.”

Richardson and his partner, Zoe Barrett, have spotted turtles sleeping in this unusual position during both day and night. And at least one turtle seems particularly attached to its unconventional bed.

“This is the 5th time I have seen this one sleep like this,” Richardson said.

Sea turtles are surprisingly particular about where they rest.

Some tuck themselves into rocky crevices or shelter beneath coral ledges. Others settle on the seafloor, sometimes returning to familiar resting areas.

And this isn’t just something divers have noticed. Scientists have spent decades studying how sea turtles choose places to rest.

A 1997 study published in Coral Reefs documented hawksbill turtles repeatedly returning to preferred underwater resting sites. Researchers also observed immature hawksbills sheltering around reef crevices and ledges.

In 2016, researchers tracking 11 juvenile green turtles in Florida discovered that some ventured into deeper water, often at night, to rest. Interestingly, the deeper-water turtles spent more time resting, made longer resting dives, and showed lower average activity-related energy expenditure. The findings suggest that turtles may sometimes benefit from traveling to a better resting location, even if reaching it takes extra effort.

The giant sponge in the Philippine footage might offer a similar advantage. Perhaps it provides shelter, helps keep the turtle in place, or simply makes for a convenient place to rest.

There’s another intriguing connection: hawksbill turtles regularly eat marine sponges. So a turtle sticking its head into one wouldn’t necessarily be unusual in itself. But feeding and sleeping are different behaviors, and there’s no indication that this animal is trying to eat its pillow.

Unlike fish, sea turtles have lungs. They must eventually surface to breathe. Yet they can remain underwater for remarkably long periods, particularly when they’re resting.

The secret is largely about conserving energy. A resting turtle uses much less oxygen than one actively swimming or searching for food. By reducing its activity and metabolic demands, it can stretch its oxygen supply over a much longer dive.

According to NOAA Fisheries, sea turtles can remain submerged for hours under natural conditions, including while sleeping.

A 2014 study of 11 wild green turtles found that the animals adjusted their breathing according to their activities. During resting dives, they used their oxygen reserves extensively, then typically took five to seven breaths at the surface before descending again.

But are they genuinely sleeping or just lying still?

Turtle Sleep

In a 2008 experiment in the Seychelles, scientists fitted a hawksbill turtle with a sensor that monitored tiny movements of its mouth. These rhythmic movements, known as buccal pumping, are thought to help turtles detect chemical signals in the surrounding water. The researchers found that the movements stopped during the middle of prolonged resting dives.

That pause suggested the turtle had entered a sleep-like state rather than simply remaining motionless. It’s compelling evidence, although directly confirming sleep in a wild turtle remains difficult.

Which brings us back to the turtle in Moalboal.

We can’t tell exactly what’s happening inside its brain, or why this particular sponge has become such an attractive resting spot. But, surprisingly, its behavior fits with what researchers already know about sea turtles and their underwater resting habits.

And perhaps that’s the most relatable part of the whole spectacle: even sea turtles seem to have their preferred place to put their heads down.