How Animal Sleep
How animals sleep.
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Giraffes
They sleep about 2 hours a night, taking 1-6 minute naps while standing. Since it takes these long legged creatures almost half an hour to get up, they usually sleep on their feet. This way it can escape if its only predator, the lion comes. The giraffe does sleep for longer periods, but not often. The giraffe will relax its muscles and will lie down for a 20-minute nap, hopefully during time the lions sleep (which is up to 22 hours a day).
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Sea mammals
Sea mammals, such as dolphins and whales cannot sleep with its brain fully off. They will only rest half of their brains and bodies at a time and will take turns for each side. Meaning they can sleep and swim at the same time. They will take about 20 minute naps between each side of the body.
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Parrotfish
When this fish goes to sleep, it creates natural bedding made out of its snot. This foul smelling mucus creates a little “sleeping bag” around itself with 2 openings so it can breathe. This coating also keeps predators away due to the bad smell, and will allow the fish to sleep peacefully.
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Wood frog
When the temperature drops below freezing (often in the winter) the frog will seem to die from the cold. The animal is not really dead; it is actually in a very deep sleep. Up to 45% of its body freezes. Breathing, blood flow, and heartbeat of the frog stops. The animal is still alive because it produces natural antifreeze, glucose, which prevents the frog’s organs from freezing up. In the spring (about 3 months) the frog comes out of its long sleep. A few hours later it will defrost, restart its heartbeat, and hop away.
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