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The more general brain development of the animal behind the less time sleeping they need, because the brain is the evolution of animals from the last one of the senior organ, the human brain is the youngest, and therefore we are not very perfect, and need the regular rest, but like a rat, it just need little sleep. Also, the fish is sleeping, sleeping or not is not muchrelated to closing eyes or not, and some fish can swim while sleeping, such as tuna. In addition, the nutritional intake in relation to the physical consumption of small animals need to sleep, in order to slow down the metabolism.

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16y ago

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