Drinking unfermented tea at night will affect sleep, but drinking fermented tea will not affect sleep.

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Tea contains theophylline and caffeine. As a stimulant of central nervous system, it can temporarily dispel drowsiness and restore energy. It is used to treat neurasthenia and coma in clinic. Drinking tea at night may cause nervous excitement and make it difficult to sleep.

But if you drink fermented tea, the effect will be different. Through the fermentation process, tea leaves oxidize or transform the highly irritating alkaloids and active polyphenols into small molecular substances that are more beneficial to human absorption, thus reducing the irritation to the stomach and the excitement to human nerve endings.

Drink the right tea, but also pay attention to the way of drinking tea. It is recommended to drink light tea, because drinking strong tea will increase the burden on the kidneys, especially drinking too much tea before going to bed. After falling asleep, the water in your body is still running, which may cause side effects such as edema, and the kidneys work endlessly, which is not in line with the coordinated operation of body functions.

Don't drink tea before going to bed 1 hour, because it takes a little time for the body to digest and excrete, and digesting the tea or food eaten before is more conducive to the body's sleep.