The Advantages of Getting Sunlight First Thing in the Morning: Everything You Need to Know
Before you reach for your morning coffee, there may be a simpler way to wake up your body and brain: stepping outside. Health experts say morning sunlight benefits everything from sleep quality to mood, and the timing of that exposure matters as much as the dose.
“Light and darkness are cues your body needs for alertness and sleepiness. They tell you when to wake up and when it’s time to wind down by regulating hormones like melatonin,” Alexandra Lessem, a family nurse practitioner, told Banner Health.
Lessem said sunlight is “a natural way of ‘turning on the switch’ to the assembly line of activities that regulate your body,” adding that “having exposure to sunlight helps regulate the metabolic and chemical changes that manage mood and wakeful activities.”
How Morning Sun Resets Your Body Clock and Energy Levels
Your circadian rhythm “is your body’s natural 24-hour clock,” according to Cleveland Clinic. “It keeps your body operating on a healthy wake-sleep cycle. Your circadian rhythm affects many other systems throughout your body. Most people’s circadian rhythms are automatic, but certain factors like light can have an effect on them.”
That is why early light exposure has such an outsized effect on energy and alertness. “Light is the source for setting the circadian clock when you wake,” Lessem said. The clock is most responsive to light about an hour after waking, about two hours before bedtime and throughout the night, per Verywell Health.
Dr. Smita Patel said studies have found that daylight exposure “increases sleep duration and improves sleep quality.” Sunshine, she added, “may play a role in regulating hormones, your body’s internal clock (circadian rhythm), and sleep patterns by affecting the melatonin secretion in the evening hours prior to bedtime.”
Why Sunlight Is the Body’s Main Source of Vitamin D
Vitamin D is often called the “sunshine vitamin” for a reason. “Your skin makes vitamin D naturally when it is exposed to UV rays. The outer layer of the skin (the epidermis) is responsible for starting the process of making vitamin D in response to sun exposure,” per the American Cancer Society.
The nutrient does more than support bones. The American Cancer Society says vitamin D’s primary function is “to keep bones and teeth strong by helping the body absorb and use calcium and phosphorus in the right way.” It also “helps control inflammation (swelling) and the growth of cells, keeps muscles strong, and helps the immune and lymph systems and nervous system work like they should.” Studies suggest low vitamin D levels may be linked to seasonal affective disorder and mood changes.
For bones specifically, vitamin D drives several processes, per OKC Orthopedics Sports Medicine. It boosts calcium absorption in the gut from as low as 10-15% without it to 30-40% with sufficient levels. It helps deposit calcium into bones through a process called mineralization, keeps the bone remodeling cycle balanced and helps regulate phosphate levels.
Immune Support and a Brighter Mood From Morning Light
UVB rays, the same ones that cause sunburn, also “trigger vitamin D production in the skin, a key process for immune support,” per UF Health. Once converted into its active form, vitamin D binds to receptors in immune cells and supports the body in several ways, including enhancing the innate immune system, regulating and calming the adaptive immune system and reducing the risk of some inflammatory and autoimmune diseases.
Morning light may also lift your mood before any caffeine kicks in. “Sunlight increases the brain’s release of serotonin, a neurotransmitter that helps you feel more calm and focused. Increased risk of depression and seasonal affective disorder (SAD) are associated with low exposure to sunlight,” per the University of Texas at Dallas’ Center for Brain Health.
The center recommends a simple habit: “Step outside when you take breaks. Surround yourself with sunlight and fresh air to help your brain reset.”
Sunlight vs. Coffee: What Caffeine Can’t Do for You
Coffee delivers a quick jolt, but caffeine cannot reset your circadian clock the way light does. Morning sun cues the body to ramp up alertness and wind down melatonin in the evening, setting a rhythm that supports steadier energy through the day and easier sleep at night. Pairing a few minutes of outdoor light with your usual cup of coffee may help you start the day with the kind of focus caffeine alone can’t deliver.
The Risks of Too Much Sun
Sun exposure is not risk-free. Too much unprotected time in the sun’s ultraviolet (UV) rays can damage the skin, eyes and immune system, and it can cause cancer. Dermatologists urge wearing sunscreen to protect against sun damage.
“When we think about ultraviolet radiation — which is what we’re concerned about in terms of these harmful sun rays — we split that generally into UVA and UVB,” Dr. Klint Peebles, MD, a dermatologist in Washington and suburban Maryland at Mid-Atlantic Permanente Medical Group, told the American Medical Association. “Ultraviolet A is really what I like to call ‘the aging ray.’”
“These are the rays that prematurely age the skin. They’re going to cause wrinkling, fine lines and age spots,” Peebles added. “They also pass through window glass, so whether it’s glass in the office, your home or car they get through.”
UVB rays are different, he said. “On the other hand, ultraviolet B, or UVB, would be what I call the burning ray, and these would be the primary cause of sunburn. Those are largely blocked by window glass, but not always — it just depends on the context.”
This article was created by content specialists using various tools, including AI.
