Here Comes The Sun
How spring sunlight helps reset your body after winter and how to safely build sun tolerance for summer
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As the days begin to stretch a little longer and the light slowly returns, many of us feel the natural pull to spend more time outside. After months of shorter days and limited sunlight, spring offers a gentle transition back into the rhythms our bodies were designed to live with. Sunlight isn’t just about warmth or getting a tan, it provides important signals that help regulate many of the systems that support our health.
For most of human history, daily life was closely aligned with the cycles of the sun. Natural light helped guide our sleep patterns, hormone production, mood, metabolism, and immune function. Today, many of us spend the majority of our time indoors under artificial lighting, which can disrupt these natural signals. As spring arrives, reintroducing regular sunlight exposure can help the body recalibrate and reconnect with these rhythms.
Sunlight and Your Internal Clock
One of the most powerful ways sunlight influences the body is through the regulation of our circadian rhythm — the internal clock that governs sleep, wakefulness, and many hormonal processes. Exposure to natural light, particularly in the morning, sends a signal to the brain that it’s time to be awake and alert. This light exposure also helps regulate the timing of melatonin production later in the evening, supporting deeper and more consistent sleep.
When the body receives regular natural light during the day, it can better synchronize cycles of energy, focus, and rest. Research has shown that consistent daylight exposure helps improve sleep quality, daytime alertness, and overall circadian alignment. Even a few minutes of sunlight in the morning can help reinforce these signals and support a healthier rhythm throughout the day.
Sunlight, Vitamin D, and Mood
Sunlight also supports several key biological processes that influence both physical and mental health. When ultraviolet B (UVB) rays interact with the skin, they trigger the production of vitamin D: a nutrient that plays an essential role in immune function, bone health, inflammation regulation, and hormone balance. Many people living in northern climates experience reduced vitamin D levels during the winter due to lower sun exposure, which is why spring sunlight can be especially supportive as the body begins to restore these levels.
In addition to vitamin D production, sunlight influences neurotransmitters that affect mood and emotional well-being. Exposure to natural light has been linked to increased production of serotonin, a chemical associated with feelings of calm, motivation, and overall well-being. This is one reason many people notice an improvement in mood and energy as the days become brighter and longer in the spring.
Rebuilding Sun Tolerance for Summer
Spring is also an ideal time to gradually rebuild the body’s tolerance to sunlight after months of minimal exposure. Rather than suddenly spending long hours in strong summer sun, slowly increasing time outdoors allows the skin and body to adapt more comfortably. Starting with short periods outside (even five to ten minutes of sunlight on the skin) can begin this adaptation process. Over the coming weeks, exposure can be increased gradually while paying attention to how your body responds.
Nutrition can also support the body’s resilience to sunlight. Foods rich in antioxidant compounds such as carotenoids and polyphenols (including carrots, sweet potatoes, leafy greens, berries, and olive oil) help support the skin’s natural protective mechanisms. Proper hydration and healthy fats also play a role in maintaining skin health and supporting the body’s response to environmental stressors.
As the sun returns, consider creating a simple daily ritual around getting outside. A short walk in the morning, a few minutes of stretching in the sunlight, or simply stepping outdoors to breathe deeply can help signal to your nervous system that the day has begun. These small moments of connection with natural light can help regulate energy, support sleep, and reconnect the body with the rhythms it was designed to follow.
A Gentle Reminder
As we move into this brighter season, consider sunlight not just as something we experience, but as something that supports and communicates with the body. A few intentional moments outside each day can make a meaningful difference over time.
Sometimes the most powerful health tools aren’t complicated, they’re simply the natural elements our bodies have always evolved alongside. So as the light returns this spring, take a moment to step outside, breathe deeply, and let your body reconnect with one of the most fundamental rhythms of life.
With Gratitude,
Zoe
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References
Holick, M. F. (2007). Vitamin D deficiency. New England Journal of Medicine.
Walker, W. H., et al. (2020). Light exposure and its effects on sleep and circadian rhythms. Sleep Medicine Reviews.
Lambert, G. W., et al. (2002). Effect of sunlight and season on serotonin turnover in the brain. The Lancet.
Weller, R. B. (2016). Sunlight has cardiovascular benefits independently of vitamin D. Journal of Investigative Dermatology.
Hewison, M. (2012). An update on vitamin D and human immunity. Clinical Endocrinology.
