Drinking milk tea can not sleep for the following reasons: 1, because milk tea is rich in certain theophylline composition, theophylline is a compound that can make the human nerve center appears abnormal sensitivity, brain cells neurons abnormal impulses and discharge. If a large amount of theophylline is ingested and consumed on an empty stomach, it can cause serious insomnia.2. People who have experienced anxiety, tension and neurasthenia in the past usually have a shortened deep sleep phase and an extended light sleep phase. This kind of people if the intake of excessive milk tea, milk tea in the tea polyphenols and other factors will make the deep sleep phase shortened, so drinking milk tea will lead to sleeplessness. 3, drinking milk tea sleeplessness is also related to milk tea contains certain caffeine, caffeine is excitatory neurotransmitters, will lead to abnormal brain nucleus discharge, so drinking milk tea will sleeplessness.