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Fact of the Week
Learn a different fact every week!


Sperm whales stand up to go to sleep.
Fact of the week
18 January 2021
Sperm whales stand up to go to sleep.
When sperm whales need a nap, they do what scientists call a drift-dive. They take up a straight, vertical position, drifting just beneath the surface of the water, usually in groups of five or six. Sperm whales fall into a deep, motionless sleep for 10-15 minutes at a time, a few times per day. They don't breathe while they sleep as they need to be conscious to take a breath. They spend just 7% of their day resting, getting less sleep than any other mammal in the world.

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