2. Tea contains tea polyphenols, especially green tea and Longjing tea oolong tea. These unfermented teas contain more tea polyphenols. Tea polyphenols, like caffeine, have refreshing effects. If you drink these teas at night, it will be difficult to sleep at night. If you usually drink less tea, or people with poor sleep quality at night, try not to drink these teas, which may easily cause insomnia.
3. If it is some tea for nourishing blood and keeping fit, such as red dates, gouqi tea, longan and lotus seed tea, or flower and fruit tea and chrysanthemum tea for clearing liver and improving eyesight, the tea made from the above ingredients has the effects of enriching blood and astringing deficiency, clearing liver and improving eyesight, and you can drink this tea at night, but in moderation.