Drinking milk tea can cause sleeplessness, which may be caused by the following situations: first, because milk tea contains substances that excite the central nervous system, such as theophylline, etc. When these substances enter the brain with the blood circulation, especially the central nervous system, it will cause the brain nerves or brain cells to increase the discharge frequency, resulting in brain cells in a continuous state of excitement, which can also cause the brain nerves to continuously issue nerve impulses, so that people think, consciousness, feeling enhanced, there will be sleeplessness; second, may be because of a certain stimulating effect on the gastrointestinal tract, because milk tea contains more added substances, these substances stimulate the intestinal tract, will stay in the gastrointestinal tract for a longer period of time, the gastrointestinal tract skin mucosa and sensory nerves caused by stimulation, causing increased peristalsis of the gastrointestinal tract, will also indirectly lead to sleeplessness This can also indirectly lead to sleeplessness.