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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. The new findings show that while elephant seals may spend 10 hours a day sleeping on the beach during the breeding season, they average just 2 hours of sleep per day when they are at sea on months-long foraging trips. They sleep for about 10 minutes at a time during deep, 30-minute dives, often spiraling downward while fast asleep, and sometimes lying motionless on the seafloor.

United statesMonterey bayMonterey canyonTaiki adachiPacific oceanJessica kendallDaniel lozanoTerrie williamsPatrick robinsonOleg lyaminAlexei vyssotskiRoxanne beltranTheresa keatesRachel holserOffice of naval researchUc san diego scripps institution of oceanography