Babies are usually not allowed to sleep with night lights on. Infants sleeping with night lights on may have an impact on their visual development, endocrine system, sleep quality, and other factors. The detailed examination is as follows.

        1. Visual development: The first critical period of an infant's visual development occurs between the ages of 0 and 3 years. Sleeping with the night light on may harm the infant's eyeballs and ciliary muscles, impairing visual development.

        2. Endocrine system: Sleeping with the night light on may cause endocrine disorders in infants, but it also inhibits melatonin secretion, resulting in decreased immune function. If this occurs, it is strongly advised to seek medical attention as soon as possible.

        3. Sleep quality: Sleeping with the night light on may impair the infant's sleep quality, resulting in symptoms such as disrupted sleep and insufficient sleep time. As a result, try to place the infant in a quiet and dim environment to improve sleep quality.