Что такое сон?

Сон - физиологическое состояние, возникающее преимущественно в темное время суток, характеризующееся торможением активного взаимодействия со средой. Осознаваемая психическая деятельность прекращается не полностью. Внешне сон проявляется некоторым стереотипным положением тела, минимальной двигательной активностью, снижением реакций на стимулы, обратимостью и характерными циклическими изменениями мозговых функций.

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