9 animals that never sleep​ at night

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Dolphins

Sleep with one eye open and only half of their brain at a time, which is called unihemispheric sleep.

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Ants

Take brief naps throughout the day, totaling around 250 minutes of sleep per day.

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Bullfrogs

Can go without sleep for long periods of time and use rest to conserve energy.

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Elephants

Get a mere two hours of shut-eye per night and can skip a night's sleep without needing to nap the next day.

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Giraffes

Sleep for short bursts, totaling around 30 minutes per day. They can spend several weeks without sleeping.

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Orcas

Also known as killer whales, babies spend their first few months without any sleep

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Alpine swifts

Can stay in the air for months without landing or sleeping. They sleep on the wing for brief periods during migration.

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Walruses

Can go for 84 hours with no sleep. They can sleep anywhere on land, on the bottom of the ocean, or floating.

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