Sleeping with the light on at night may have an impact on the infant’s sleep quality, growth and development, and melatonin secretion in the body. 1. Sleep quality: a bright environment will cause the central nervous system of the baby’s brain to be in a state of excitement, resulting in the baby’s restlessness and inability to enter a state of deep sleep, so it is possible to have an impact on the quality of the baby’s sleep. 2. Affect the spirit of the next day: sleeping with the light on at night, the light will stimulate the baby’s eyes, resulting in the baby can not fully rest at night, thus affecting the baby affect the next day’s life. 3. Melatonin secretion in the body: the body needs to be in a dark environment in order to facilitate the secretion of melatonin, turn on the light to sleep when the light will inhibit the secretion of melatonin in the body of the baby, is not conducive to growth and development. Therefore, do not turn on the light when the baby sleeps at night, so as not to cause adverse consequences, such as the emergence of anomalies, please consult a doctor in a timely manner to identify the causes of active treatment.