Going to bed late can have a range of negative effects on a child's physical and mental health. Here are the five main hazards:
1.*Affects growth and development**: Going to bed late may affect your child's growth and development. Growth hormone generally peaks at around 10 p.m., and if the child goes to bed late, this peak will be missed, resulting in a decrease in growth hormone secretion, which in turn affects the child's growth and development. 
2.*Lowers immunity**: Getting enough sleep helps boost immunity. If your child goes to bed late, it can affect the normal functioning of the immune system and make your child more susceptible to viruses and bacteria. 3.*Affect Xi learning efficiency**: Sleeping late may cause children to have insufficient energy and concentration in the next day's school Xi, affecting the efficiency of school Xi. 4.*Increased stress**: Going to bed late may cause children to feel more stressed during their school Xi the next day, as sleep deprivation can affect mood and mental state. 5.*Forming Bad Xi**: If your child Xi is used to going to bed late, it may form bad Xi habits, which will affect the quality of life and health in the future. 
Therefore, parents should pay attention to their children's sleep time to ensure that they are able to sleep on time. Getting enough sleep is essential for a child's physical and mental health.