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Simply put, accumulated nervous excitement can't “just disappear.” Nerve impulses arise because they are necessary for the implementation of certain actions-whether it is movement, digestion of food, or thinking about the great. And it's not just the sympathetic and parasympathetic nervous systems – they are only responsible for providing the necessary physiology for the body.
But the central nervous system provides “macro-reactions”. In it, first of all, the notorious overexcitation accumulates. It should be “directed in a peaceful direction”. Left to her own devices, she can do this in the most bizarre ways-mimicking an itch ( thequestion.ru ) or by twitching your limbs. Therefore, for example, it is recommended to count sheep at bedtime – this is the most harmless discharge for the nervous system.