There is light can not sleep is a normal phenomenon, not a disease, caused by two main reasons: 1, with the person’s sleep habits, people sleep in the house with light will appear a psychological implication, usually have been resting in a dark environment, the house occasionally appear light will think about the role of light stimulation affect the quality of sleep, the more you think about the more sleep is a psychological effect. 2, caused by the stimulation of light, some people More sensitive to light, sound, etc., long-term light stimulation will affect the quality of sleep, long-term rest in the house with light, may cause dizziness, headache, drowsiness and other symptoms after getting up during the day. It is best to rest in a warm and comfortable environment with the right temperature, if insomnia can turn off the lights to rest or change the environment to ensure good sleep quality.