Northern elephant seals have adapted to sleep and dive at the same time all while avoiding predators. New research, based on the recorded brainwaves of the seals, revealed the marine mammals get ...

Northern elephant seals are also able to sustain themselves on about two hours’ sleep, according to a study published Thursday in the journal Science.

Killer whales and sharks attack the seals at the surface, which is why elephant seals have evolved to sleep in the ocean depths, scientists said.

Those sleep patterns revealed that northern elephant seals conk out, on average, around two hours per day while on months-long foraging missions.

Brainwave patterns show elephant seals take short naps while holding their breath on deep dives, averaging just 2 hours of sleep per day while at sea.

The surprisingly short shut-eye may be a way for the elephant seal to avoid predators—an intriguing find from the first-ever sleep study on marine mammals in the wild.

Elephant seals get the most sleep during breeding season, while they're lying on the beach. But scientists now have an idea of how they sleep while they're out at sea on monthslong foraging trips.

For the first time, scientists have recorded brain activity in a free-ranging, wild marine mammal, revealing the sleep habits of elephant seals during the months they spend at sea.

Northern elephant seals might be masters of multitasking in the animal kingdom because they’ve learned how to sleep and dive at the same time — all while avoiding predators. The elephant seals ...