Sleep comes with conditions - to sleep at night, to sleep in a dark bedroom without lights. If these conditions are violated, such as sleeping with the lights on, it can be detrimental to your health. Researchers have confirmed that sleeping with the lights on will inhibit the body has a secretion called melatonin, making the body's immune function is destroyed. Therefore, many people are vulnerable to viral threats after picking a light is this reason.

Medical experts warn that sleeping with the lights on not only affects immune function, but also makes you susceptible to cancer. Foreign research shows that stewardesses, doctors, nurses and other night shift a family, the incidence of cancer than normal people to be two times higher. Not only should not sleep with the lights on, is to wake up in the middle of the night to go to the bathroom, do not turn on all the lights. Because even a short period of light will make the human body body secretion of melatonin enzyme secretion sharply reduced. Melatonin is a regulatory hormone in the human body, through its regulation, in order to make the human body during the day, night, four seasons of the physiological clock rule normal operation. Melatonin secretion increases dramatically at night. But exposure to light at night will make melatonin secretion sharply reduced, and thus the body's physiological clock is disturbed, will lead to the occurrence of disease.