For many teenagers, late-night studying, homework, social media and early school mornings can make a good night's sleep seem like a luxury. But sleep is not wasted time, nor is it a sign of laziness. It is an essential part of growing up, supporting good health and helping the brain learn. Developing healthy sleep habits for both teens and parents can make a real difference to daily life.

Why is sleep so important?

Sleep gives the body and brain time to recover, grow and prepare for the next day. During sleep, the brain processes and consolidates memories, helping us retain new information and skills. Sleep also supports attention, problem-solving, emotional regulation and decision-making. Physically, it helps regulate hormones involved in growth, appetite and metabolism, supports immune function, and contributes to healthy heart and mental health.

It is important for teenagers to get enough sleep as their brains are still developing, their bodies are growing, and they face increasing academic and social demands. Getting adequate sleep may help them have better concentration, learning, mood and overall well-being, whereas being sleep deprived may cause a higher risk of accidents, obesity and depression.

How much sleep do teenagers need?

The American Academy of Sleep Medicine recommends that teenagers aged 13-18 aim for 8 to 10 hours of sleep each night. Younger children aged 6-12 generally need 9 to 12 hours. Getting enough sleep regularly is important, as catching up at weekends may not make up for lost sleep during the school week.

Many teenagers in Singapore are not getting enough sleep. A 2025 study of students in junior colleges, polytechnics and ITE found that they slept around 6 hours on school nights, compared with about 8 hours on days off. An earlier Singapore study also found that teenagers who slept less tended to report poorer health and more symptoms of depression.

What helps, and what gets in the way?

During adolescence, the body's internal clock naturally shifts towards later sleep and wake times. Teenagers may feel alert late at night but still need to get up early for school. Homework, tuition, examinations, co-curricular activities, long commutes and late-night phone use can make the problem worse.

The good news is that small, consistent changes can help:

1. Keep a regular schedule. Aim to go to bed and wake up at similar times every day, including weekends. Avoid large shifts in sleeping hours between school days and holidays.

2. Make the bedroom sleep friendly. Keep it cool, dark, quiet and comfortable.

3. Wind down before bed. Choose a relaxing routine, such as reading, gentle stretching or listening to calming music. Put phones, tablets and computers aside at least 30 to 60 minutes before bedtime where possible. Bright light and stimulating online content can delay sleep.

4. Watch caffeine intake. Coffee, strong tea, energy drinks and some soft drinks can make it harder to fall asleep, especially when consumed in the afternoon or evening.

5. Get daylight and exercise. Regular physical activity and exposure to natural morning light help regulate the body clock. Avoid vigorous exercise too close to bedtime if it makes you feel more alert.

6. Plan schoolwork realistically. Break assignments into manageable tasks and avoid routinely sacrificing sleep for late-night revision. A rested brain is better prepared to learn.

Parents can help by encouraging routines, setting reasonable expectations around evening activities and screen use, and discussing workload without turning bedtime into a daily battle. Schools and families can also consider whether early schedules and excessive commitments are leaving enough time for sleep.

Does less sleep really affect school performance?

Yes. When teenagers do not get enough sleep, they may find it harder to concentrate in class, remember what they have studied and apply what they know to unfamiliar questions. They may also react more slowly, make poorer decisions, feel irritable or lose motivation. As a result, lessons may be harder to follow and revision less effective, even if they spend more time studying.

Research supports the link between sleep and learning. Teenagers who regularly get too little sleep tend to have more difficulty with attention and memory and may not perform as well at school. A Singapore study also found that factors such as spending more time studying, going to bed later, starting school early and having a long journey to school were linked to shorter sleep.

Although these studies do not mean that sleep alone determines grades, they highlight an important point: more study time does not necessarily mean more learning if the brain is too tired to concentrate and remember. Sleep should be part of a study plan, not the first thing sacrificed when examinations approach.

A healthier approach for the whole family

Good sleep hygiene is about building habits that make sufficient sleep possible, rather than expecting teenagers to overcome biology through willpower alone. Start by moving bedtime earlier in small steps, keeping a consistent routine and reducing late-night distractions. If a teenager regularly struggles to fall asleep, snores loudly, has persistent daytime sleepiness or remains exhausted despite sufficient time in bed, seek advice from a healthcare professional.

Sleep is not a reward to be earned after homework is completed. It is one of the foundations that makes learning, good health and emotional resilience possible. For teenagers navigating the demands of growing up in Singapore, protecting sleep is an investment in both well-being and academic potential.

Selected References

1. Paruthi S, et al. (2016). Recommended amount of sleep for pediatric populations: A consensus statement of the American Academy of Sleep Medicine. Journal of Clinical Sleep Medicine, 12(6), 785–786.

2. Wang CKJ, et al. (2025). Adolescents' sleep patterns, chronotype, social jetlag, school arrival time and sleep duration: Comparisons of three post-secondary education systems in Singapore. Acta Psychologica, 260, 105711.

3. Yeo SC, et al. (2019). Associations of sleep duration on school nights with self-rated health, overweight, and depression symptoms in adolescents: Problems and possible solutions. Sleep Medicine, 60, 96–108.