As the days grow shorter and cooler, many people notice a dip in energy and mood. The good news? Nature already provides one of the simplest tools to help us feel better — sunlight. Sunlight is more than something that brightens a fall day — it directly affects how our brains function. When sunlight hits your skin and eyes, your body produces serotonin, often called the “feel-good hormone.” This powerful chemical helps regulate mood, reduce anxiety, and support focus and calmness. According to research from the National Institutes of Health, just 15 to 30 minutes of direct sunlight a day can help balance your body’s circadian rhythm — your internal clock that controls sleep and wake cycles. Keeping this rhythm steady supports better rest, stronger mental health, and improved resilience to stress.