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Who said that when a person is asleep, he is in a state of complete rest? Not a bit. Our body during sleep works as an excellent machine, which makes many important operations! Firstly, there is an active synthesis of ATP, the substance known as a universal source of energy for living systems. Second, while we parapumem, is made up 75% of the growth hormone... thirdly, during sleep we produce testosterone, which is responsible for sexual development. So it only seems to us that we have a rest...