The most obvious harm is to reduce our sleep quality. I usually sleep with the light on occasionally, which is really a wake-up call. Some people can't sleep with the lights on, which directly leads to insomnia. In this way, it will lead to neurasthenia and other phenomena.

Once I stayed in a hotel alone, and it was a flight after five in the morning, for fear of oversleeping. So I sleep with the lights on and the TV on. I'm really half asleep and sleepy, but I can't sleep well. This lasted for several hours, and the moment I got up, I felt my whole head buzzing.

Furthermore, it will reduce people's immunity. When you sleep with the light on, the organs in your body will think that this is not a rest time. When they touch the light source, they are not in a dormant state. In this case, your body's fatigue will increase. If you don't have enough rest, your immunity will decline. Bacteria and viruses can easily invade our bodies, from colds and fever to cancer.

Finally, turning on the light to sleep will also interfere with human hormone secretion. Turning on the light will make your body hormonal and endocrine disorders. Your weight will also change, fat will accumulate and your body will get fat. Especially children, need to pay more attention to this problem. Sleeping with the light on will affect their development and may lead to their abnormal growth.

Therefore, in order to get a healthy body, it is very important to keep a good sleep. Sleep in a quiet environment without light and noise. Stay away from mobile phones, go to bed early and get up early. Good habits have been formed.