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Elephant Seals’ Sleep Patterns Have Been Recorded For The First Time, Showing That During Foraging Trips They Sleep For Only 2 Hrs/Day, Similar To African Elephants. They Nap For 10 Mins At A Time During Deep 30 Mins Dives And Sleep Over 10 Hrs/Day On The Beach During Breeding Season. This Data Could Identify & Protect Seals’ Rest Areas.

Elephant seals enter 'sleep spiral' during ocean dives | CNN

https://www.cnn.com/2023/04/20/world/sleep-diving-seals-scn/index.html

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 only about two hours of sleep a day while foraging.