Elephant Seals Take Power Naps During Deep Ocean Dives - The New

Killer gas aids elephant seals' deep dives, Science

Sleepy Seals Bug Woman – Adventures in London

Mapping uncharted undersea volcanoes, and elephant seals dive deep to sleep, Science

Elephant seals take power naps in the ocean while slowly sinking

NOAA's Cordell Bank National Marine Sanctuary - Shhhhh… this elephant seal is fast asleep! Perhaps it's tired from its migrations. Elephant seals are the only known mammal to make two migrations each

Some Ocean Optimism Ep. 3: Elephant Seals

I Met a Beautiful Lady at the Beach, and She Changed My Life, by Brian Feutz, The Memoirist

Elephant Seals - Point Reyes National Seashore (U.S. National Park Service)

Sleeping elephant seals fall through ocean's depths, and some even nap on the sea floor - ABC News

Seals uncover new ocean depths in East Antarctica - Institute for Marine and Antarctic Studies

Elephant seals enter 'sleep spiral' during ocean dives

Elephant Seals Take Extreme Power Naps in the Open Ocean, Smart News

Seals have REM Sleep Spirals at Sea

Northern elephant seals take deep dive sleeps to escape predators

Sleeping elephant seals fall through ocean's depths, and some even nap on the sea floor