Drinking tea has an exciting effect on human central nervous system, and its pharmacological effects are mainly produced by xanthine derivatives, caffeine and theophylline contained in it. Caffeine and aromatic substances in tea are stimulants that can excite the central nervous system of the brain. People will be very excited after drinking tea, which makes the central nervous system keep working, making it difficult for people to calm down, thus leading to insomnia.

Suggestion: Don't drink tea before going to bed, especially strong tea. If you are working during the day and want to relieve physical fatigue, you can drink a little light tea properly, which is totally ok. If you are sensitive to tea, try not to drink tea after meals.