There are four different stages in sleep. Especially important is the stage of deep sleep, which begins 35-45 minutes after falling asleep. During deep sleep, the immune system is reset. During this period, a certain type of immune cells is regenerated, responsible, including, for the recognition and destruction of cells infected with the virus. In addition, the release of cytokines - proteins involved in the immune response to infection. Because of a lack of sleep, all these processes are violated, which weakens the immune system, explained Bruntner.

"If you were in contact with the virus during the day, and your body did not reboot in a dream, there is a high risk that you will get sick," warns the expert.. "And if your immune system is already working at the limit because of lack of sleep, it will be very difficult to fight the flu". Moreover, as research shows, lack of sleep reduces the effectiveness of the vaccine against influenza. In case you are sick, deep sleep that helps to activate the immune system can also help.

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