"Artificial light", as the name suggests, is the light emitted by light sources created by humans. It includes not only the light produced by outdoor street lights, billboards, electronic screens, etc., but also the light emitted by various lighting equipment, electrical appliances and electronic equipment in our homes. In this era of rapid technological advancement, "artificial light" has penetrated into every aspect of our lives. However, while "artificial light" brings us convenience, it also affects our circadian rhythm invisibly, especially for children, its impact is more obvious. Children's eyes and brains are still developing and are much more sensitive to light than adults. Therefore, inappropriate exposure to "artificial light" may cause severe disruption to their sleep.