Occasional use of night lights is not seriously harmful to children, but long-term use may disrupt the day and night rhythms, endocrine effects, and so on. 1. Destroy the day and night rhythm: the night light will make the child can not distinguish when it is day and when it is night. This causes some children to sleep during the day and be energized at night. Serious can affect the child’s work and rest, leading to sleep difficulty. 2. Impact on the endocrine: If you sleep with a nightlight on for a long time, it may also affect the baby’s melatonin secretion, melatonin promotes sleep. The reduction of melatonin will affect the baby’s sleep quality, resulting in the child can not enter a deep sleep, affecting the growth and development of the child. Long-term use of a nightlight may have other effects on the child, it is recommended to create a good sleep environment for children, if necessary, can be briefly use a nightlight, but not for a long time.