Sleeping with the lights on at night is not good for your health. Normal people have a circadian rhythm, and light changes are related to the daytime light, melatonin secretion is less, no light at night, melatonin secretion to increase. In the night 2-3 points is the peak of melatonin secretion, this hormone is one of the most important hormones in the body, the main role is to regulate the circadian rhythm, but also antioxidant, anti-aging, reduce the incidence of tumors, etc., on human health has an important role in promoting. If you sleep with the lights on all the time, it will disrupt the secretion of melatonin, so that the body’s circadian rhythm is disturbed, resulting in poor sleep quality, shallow sleep, easy to wake up, dreamy, etc., and the serious ones will affect the immune function, resulting in weakness, easy to be infected by viruses or bacteria and other foreign microorganisms. It is recommended to keep the room dark and quiet when sleeping at night.