Do seals sleep while swimming?

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

Seal FAQ's - Seal Rescue Ireland

Watch some of the most endangered seals caught napping underwater

A Guide to Seals

Seals, life and facts

Photo Shows How Sperm Whales Sleep

🟣 Relaxing Seals Swimming Underwater with Sleep Music

Seals, Sea Lions, and Walruses

Seals – Habitat, Behavior, Anatomy, And More

2 hours of sleep a day? How this animal can survive is a mystery.

Elephant Seals Sleep 1,200 Feet Deep Under the Ocean to Avoid Predators

Pinniped - Wikipedia