The hazards of sleeping with the lights on at night are the following: 1, reduce the quality of sleep, and even cause insomnia, the light has a direct damage to the human body, will affect the depth of sleep, which can easily lead to neurasthenia, insomnia, etc. 2, interference with human immunity, the human body will make the organs rest after entering sleep, but in the case of a light source, part of the body’s organs will come out “Duty”, this situation will aggravate the body strain, do not get rest after the immunity will also decline, easy to cause the invasion of pathogens, such as bacteria, viruses, and even their own cells will appear to mutate and induce tumors, etc. 3, interference with human hormone secretion, sleep with the lights on at night will make people’s endocrine disorders, hormone disorders, appear Fat, poor weight control, the accumulation of fat, and even female masculinization, etc.