Extra 15 minutes of sleep leads to better brain health in adolescents: Study

Sleep plays a vital role in brain development during adolescence, a time when young people are learning, growing, and building critical thinking skills. To better understand the impact of sleep on young minds, researchers from the University of Cambridge and Fudan University conducted a large study, published in the journal Cell Reports. They tracked the sleep patterns of 3,222 adolescents aged 9 to 14 using Fitbit devices and divided them into three groups based on how much they slept.

The first group slept, on average, for 7 hours and 10 minutes per night, while the second group slept for 7 hours and 21 minutes, and the third group, who got the most sleep, averaged 7 hours and 25 minutes. Those who slept the most (Group Three) showed better results in reading, problem-solving, and focus tests. They also had healthier heart rates and larger brain volumes, both signs of better physical and mental health.

Lower heart rates are often linked to better health, suggesting that those who slept more experienced better overall well-being. In contrast, higher heart rates are typically associated with poor sleep quality, such as restless sleep or excessive daytime sleepiness. This further emphasises the importance of not just the amount of sleep, but the quality of sleep, in maintaining both mental and physical health.

Although school grades stayed the same across all groups, brain scans and cognitive tests clearly showed that even small increases in sleep were linked to stronger brain development. The findings suggest that improving sleep habits, even slightly, could have a lasting positive impact on learning and overall brain health during this important stage of life.

Quick Tips to Help You Sleep Better and Stay Sharp

While it might seem hard to get more rest with school, screens, and stress in the mix, building better sleep habits doesn't have to be complicated.

Here are some easy ways to get started:

• Stick to a schedule: Try to go to bed and wake up at the same time every day, even on weekends. Keeping a consistent sleep schedule strengthens your body’s natural sleep-wake cycle, making it easier to fall asleep and wake up feeling rested.
• Limit screen time before bed: The blue light from phones, tablets, and computers can mess with your body’s sleep signals. Aim to turn off devices at least 30 minutes before bed to give your brain time to wind down.
• Create a calm space: A relaxing environment can make a huge difference in your sleep quality. Keep your bedroom cool, dark, and quiet. Consider using blackout curtains, a white noise machine, or a fan to block out distractions.
• Avoid heavy meals and caffeine late in the day: Eating large meals or drinking caffeine too close to bedtime can make it harder to fall asleep. If you're hungry at night, opt for a light snack, and avoid caffeine at least six hours before bed.
• Get some movement in: Regular physical activity can help you fall asleep more easily and sleep more deeply. Aim for at least 30 minutes of moderate exercise during the day, but try to avoid intense workouts too close to bedtime.
• Unwind before bed: Engage in relaxing activities to help signal your body that it’s time to sleep. This could be journaling, reading, meditating, or taking a warm shower. It helps reduce stress and prepares your mind and body for rest.

Sleep plays a big role in how well we think, learn, and perform, especially for young people during their crucial developmental years. By following simple tips like sticking to a regular sleep schedule and creating a calm bedtime routine, teens can improve their brain health and performance.

(Compiled by Vismaya Vijayan)