Sleep is essential for the body to recover energy and for the brain to process information, consolidating memory. Crucially, growth hormone in children is secreted most vigorously during deep sleep at night, vital for height development and nervous system maturation.

Dr. Bui Thuy Nga, a pediatrician at Tam Anh General Hospital Hanoi, emphasizes that while many parents prioritize sufficient sleep duration, the actual bedtime profoundly impacts sleep quality. Children who sleep late frequently struggle to achieve deep, continuous sleep, resulting in sleep deprivation despite seemingly adequate time in bed.

Staying up late disrupts a child's circadian rhythm, making it harder for their body to enter its natural sleep cycle. Persistent late nights can lead to accumulated sleep debt, manifesting as daytime fatigue, drowsiness, poor concentration, and declining academic performance. Some children also exhibit irritability, mood swings, and reduced behavioral control.

Furthermore, late bedtimes hinder growth hormone secretion. Most of this hormone is released during deep sleep. When children go to bed too late, their deep sleep duration shortens, negatively impacting long-term height development.

Prolonged sleep deprivation also links to metabolic disorders. Children who sleep late risk disrupting hormones that regulate hunger and satiety, leading to erratic eating patterns and an increased likelihood of becoming overweight. A weakened immune system simultaneously makes them more prone to infections.

Sleep requirements vary by age. Infants need 14-17 hours daily, without a fixed schedule. Children aged 4-12 months require about 12-16 hours, including daytime naps. Children one-two years old need 11-14 hours, and children three-five years old should get 10-13 hours. Children six-12 years old generally need 9-12 hours, while teenagers require 8-10 hours daily.

For children under 12, doctors advise establishing a bedtime before 10 PM. This ensures their bodies have ample time to enter the deep sleep cycle, a crucial period for comprehensive recovery and development.

Signs of insufficient or poor quality sleep include: difficulty waking, daytime fatigue, reduced concentration, declining academic performance, irritability, or erratic eating. If these persist, they can profoundly affect a child's long-term health and development.

To promote earlier sleep, parents should maintain a consistent sleep and wake schedule daily, even on weekends. This routine stabilizes a child's biological clock, helping their body recognize when to rest and facilitating easier sleep onset.

Parents should also limit electronic devices – phones, tablets, and televisions – for at least one hour before bedtime. Blue light from screens can inhibit melatonin, a hormone crucial for inducing sleepiness. Furthermore, avoid giving children large meals or sugary drinks in the evening.

Create a sleep-conducive bedroom environment: quiet, cool, and sufficiently dark. For young children, parents can establish a relaxing pre-sleep routine, such as warm baths, reading books, or telling stories.

Parents should seek medical attention if their child exhibits persistent sleep difficulties, loud snoring, sleep apnea, frequent awakenings, or excessive daytime sleepiness. These may indicate a sleep disorder requiring professional assessment and treatment.

Thuy Hanh