What time is best for a 12-year-old boy to go to sleep?

Patient's question:

My child is 12 years old, a boy. He doesn't know what time to go to sleep every day. I don't want him to stay up late. What time is best for him to go to sleep?
Past treatment history and effectiveness: None.
What kind of help do you want: What time is best for a 12-year-old boy to go to sleep and not stay up late?

Doctor's answer:

A 12-year-old boy is in a period of rapid physical growth and development, and also in a peak stage of intellectual development. He has a strong need for sufficient deep sleep to allow his brain to fully recover and rest. Additionally, growth hormone is secreted most intensely between 11 PM and 2 AM. If he frequently stays up late, it may affect his physical health, especially the growth of his height. Therefore, it is recommended that he rest by 9 PM.

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