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Do seals sleep while swimming?

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Scientists discover that short naps at predator-free depths help northern elephant seals survive living out in the ocean.

Elephant Seals Can Sleep 1,200 Feet Under the Ocean Without Drowning During Their Deep Dives

Seals, Sea Lions, and Walruses

Harbor Seal, Online Learning Center

Seals, Sea Lions, and Walruses

Do elephant seals sleep on their backs? - Quora

Sleeping and Swimming – at the Same Time! – Bedtime Math

Dolphins and Whales Apparently Sleep With One Eye Open

How Do Elephant Seals Sleep in the Ocean?

Keeping seals safe – Outdoor Swimming Society Outdoor Swimming Society