Baby occasionally turn on the light to sleep, generally not harmful, long time to turn on the light to sleep, may affect the quality of sleep, but also not conducive to physical development. 1. affect the quality of sleep: long time to turn on the light to sleep, and the light is particularly strong, may have an impact on the baby’s sleep, so that the baby sleep is not stable, can not be in a deep sleep, due to the baby’s lack of sleep, may often cry more than. 2. Not conducive to physical development: because the baby’s body is in the process of rapid development, in the night time when you sleep will secrete growth hormone, long-term poor quality of sleep may affect the secretion of growth hormone, which will seriously affect the baby’s physical development. When the baby sleeps, avoid turning on the light for a long time, to adjust the indoor environment, avoid too high or too low temperature, do not exist too much noise. Seek medical attention if your baby is unwell.