Bullfrogs These amphibians are known for their ability to stay active for long periods without sleep, Giraffees often sleep while lying down, but they can also sleep while staying. Horses can sleep both lying down and standing up. They can knock their knee, allowing them to take short naps while standing. Elephants have short animal sleep cycles and spend and spend a couple of hours lying down to rest. They can go for several days without deep sleep.
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