Daylight is one of the body’s most important signals for regulating the natural sleep–wake cycle. Inside the brain is a biological clock that helps the body know when it is time to be awake and when it is time to sleep. It influences sleep, alertness, hormone production, and energy levels. During the teenage years, this biological clock naturally shifts, causing many adolescents to feel more alert later in the evening and making early mornings more challenging. Daylight helps keep this rhythm aligned.

When daylight enters the eyes, signals are sent to the brain that indicate it is daytime. This increases alertness and helps regulate hormones involved in the sleep–wake cycle. As daylight fades in the evening, these signals change, allowing the body to gradually prepare for sleep and overnight recovery.

Many teenagers spend much of the day indoors at school, at home, or using computers and mobile devices. During autumn and winter, especially in northern countries, daylight hours are much shorter. For this reason, spending some time outdoors each day can be particularly valuable. It does not have to involve long walks. Walking or cycling to school, spending recess outside, or taking a short walk during the day can provide enough natural daylight to support the body’s internal clock.

From a wellness perspective, daylight is a simple habit that can support healthy sleep and overall well-being. At the same time, it is important to remember that sleep is influenced by many factors. Regular sleep schedules, physical activity, recovery, and a balanced diet all work together to promote good health. Small daily habits can make a meaningful difference over time, and getting daylight every day is one of the easiest healthy habits to begin with.

Things to Keep in Mind

• Try to get daylight every day, even during winter.

• Spend time outdoors in the morning or around midday if possible.

• Combine daylight with a walk or other physical activity.

• Keep regular sleep and wake times whenever possible.

• Remember that healthy sleep depends on several healthy lifestyle habits.

Alma’s Tip

Many people do not realize how important daylight is for healthy sleep. As a midwife, I often remind young people that the body thrives on natural routines. Spending even a short time outdoors each day is a simple wellness habit that can help your body distinguish between day and night and support better recovery.