Sleep is a naturally recurring state. Characterized by a sense of change. Activity feel somewhat inhibited. And inhibiting the muscles that are under the jurisdiction mind almost all the sleep from wakefulness silence that has the ability to respond to stimuli decreased. And can more easily reversible hibernation in a state or a coma. Sleep is a state that has an attachment metabolism increase. By focusing on growth and regeneration, immune, nervous system, bones and muscles. Sleep found in mammalian milk, all kinds of birds and reptiles. Amphibians And many types of fish , purpose and mechanism of sleep is not entirely clear. It is also the subject of serious research often thought that sleep helps to maintain energy. But to truly reduce metabolism, only 5-10% of hibernating animals need sleep. Despite low metabolism is found in hibernating. And must be changed from the cold conditions over a normal body temperature before you sleep, making sleep "with high energy prices."
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