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

Elephant Seals May Take Siestas - The New York Times

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

Elephant seals dive asleep – and urchin death riddle solved

Elephant seals take power naps in the ocean while slowly sinking

GeoGarage blog: Elephant seals take power naps during deep ocean dives

Elephant seals enter 'sleep spiral' during ocean dives

Weaner elephant seals in action in March on CA Central Coast

Cookiecutter sharks a foe of northern elephant seals, John Lindsey, John Lindsey

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

Elephant seals nap while they dive, study finds, shedding new light on sleep

Seals have REM Sleep Spirals at Sea

Scientists are using seals to eavesdrop on whales in the deep ocean - Vox

Fear Shapes Feeding And Resting Strategies For Migrating Elephant Seals - Natural Reserve System

Elephant seals enter 'sleep spiral' during ocean dives