Drinking tea can not sleep because the tea polyphenols in the body’s nerve center is an excitatory neurotransmitter, will lead to abnormal nerve cell discharge, thus causing excessive excitation of the nerve endings, will release histamine, choline, so there will be a sleepless situation. Tea also contains theophylline, which is also an excitatory neurotransmitter that can make the nerve center excited, leading to abnormal discharge sensitivity of the central neurons, which will cause the shortening of the deep sleep phase and the prolongation of the sleep phase, and other excitatory effects. Strong tea also contains a certain amount of caffeine, which will also make the body appear over-excited nerve endings. Tea also has a diuretic effect, which can lead to frequent increases in nocturia, and therefore can lead to increased sleeplessness.