Elephant seals drift downwards into the ocean in a 'sleep spiral' to catch up on sleep while on months-long foraging trips but are programmed not to drown, according to a new study.
frameborder="0″ allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen>that it was"remarkable" that any mammal would fall asleep while drifting hundreds of feet below the water's surface.
"This is not light sleep but real paralytic, deep sleep that would have humans snoring. Remarkably, the seal's brain reliably wakes them out of it before running out of oxygen.
"We used the same sensors you'd use for a human sleep study at a sleep clinic and a removable, flexible adhesive to attach the headcap so that water couldn't get in and disrupt the signals," Kendall-Bar, a postdoctoral fellow at UC San Diego's Scripps Institution of Oceanography,The recordings showed the diving seals going into a sleep stage known as"slow-wave sleep" before transitioning into REM sleep, which leads to a kind of"sleep spiral" or sleep...
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