@undiscoveredocean: Sperm whales sleep upright at the surface in groups — discovered when a research boat accidentally bumped a sleeping one 🐋 They sleep in 10–15 minute sessions, barely breathing, not moving. Only ~7% of the day — one of the lowest sleep fractions of any mammal. Possibly slow-wave sleep with one brain hemisphere at a time to stay vigilant. #SpermWhale #WhaleFacts #OceanFacts #WhaleScience #UndiscoveredOcean

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Friday 11 September 2026 03:30:00 GMT