Can’t sleep after drinking milk tea is caused by increased nerve excitability, milk tea contains a large amount of theophylline, which is higher than the general content of tea. If the patient is sensitive to the substances that excite the nerves, the cerebral cortex will be overexcited after drinking milk tea. Normal people exist circadian rhythms, the cerebral cortex will enter the inhibitory state during the night sleep, resulting in the patient to enter the sleep, if the cerebral cortex because of the stimulation of theophylline, always maintain the excitatory state, it will lead to the patient can not fall asleep, the occurrence of difficulty in falling asleep, and sometimes 1-2 hours can not really fall asleep. This situation patients do not need too much anxiety, you can get up to carry out appropriate exercise and then go to sleep, or wait for the theophylline completely metabolized after the sleep condition can be restored, theophylline-sensitive patients are not recommended to drink milk tea before going to bed.