1. Adults sleep for about 7 hours. Due to various reasons such as physique and environment, the sleep time of normal people is not fixed, which has a lot to do with personal habits.
2. It is normal for teenagers to need 8~ 10 hours of sleep, which can give their brains a full rest.
3. Preschool children normally need 9~ 1 1 hour of sleep.
4. The normal sleep time of infants is about 14~ 16 hours.
Deep sleep time is long, indicating good sleep quality.