Whether drinking oolong tea at night will cause insomnia is related to personal constitution. Oolong tea is a kind of green tea, also belongs to a kind of tea, it contains theophylline and caffeine, can excite the central nervous system, the central nervous system excitement will easily cause insomnia, so drinking oolong tea at night may make some people insomnia. However, there are some people who are not sensitive to theophylline and caffeine, and can fall asleep at night even after drinking oolong tea. In addition to drinking tea may lead to insomnia, excessive stress in daily life, excessive tension, overwork and some disease factors may also lead to insomnia. If the insomnia symptoms last for a long time, you should go to the hospital for examination in time to clarify whether it is caused by disease factors, and should be diagnosed and treated in time. For insomnia patients, they should pay attention to conditioning in their daily life, carry out regular physical exercise every day to enhance their physical fitness and maintain a good state of mind. You should avoid overeating before going to bed, but you can consider drinking a glass of hot milk, which is helpful for improving the quality of sleep. The above can be a good improvement for most patients with mild insomnia. For some patients with severe insomnia, they need to go to the hospital in time and use sedative and hypnotic drugs for treatment under the guidance of a doctor.