It is not recommended for children to sleep with the lights on, because turning on the lights will lead to a decrease in the quality of sleep for infants, who cannot enter a deep sleep, thus affecting the secretion of growth hormone, thyroid hormone and other important endocrine hormone levels, which has a certain impact on growth and development. In addition, if sleeping under the lights, its light source will constantly stimulate the eyes, which leads to damage to the baby’s own underdeveloped vision, causing retinopathy and visual impairment, so it is not recommended to turn on the lights when the baby sleeps.