How Long Animals Sleep
By: EjazUlHaqBhat
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Most animals have a daily pattern of rest and activity. Some animals are more active during the day (diurnal) and some during night (nocturnal)
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The amount of time an animal sleeps varies by species, activity level, and other factors
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For example, koalas are known as the sleepiest animals in the world. They sleep for up to 22 hours a day
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Sloths sleep for about 20 hours a day in zoos while lemurs sleep for about 16 hours a day
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Human babies sleep for about 16-17 hours a day while tigers sleep for about 18-19 hours a day
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Bats that can hide from predators tend to sleep longer and more deeply than those that need to remain vigilant, like mice
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Many animals sleep in multiple periods throughout the day, called polyphasic sleep
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For example, dogs sleep in 45-minute bouts, and cats sleep in 78-minute periods
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