Summer arrives with a particular kind of promise. Longer days, warmer nights, and a collective exhale after months of pushing through. But beneath the season's appeal, many of us are carrying a level of accumulated stress that no vacation calendar can fully resolve. The demands of modern life do not pause simply because the temperature rises. And according to a growing body of research, the way we manage that stress has everything to do with the long-term health of our minds and bodies.

There is a nerve in your body that acts as a direct line between your brain and nearly every major organ you have. It travels from the base of your brainstem down through your neck, chest, and abdomen, touching your heart, your lungs, your stomach, your intestines. It is present in moments of deep calm and is suppressed in moments of chronic stress. It shapes the quality of your sleep, the ease of your digestion, the steadiness of your mood, and the resilience of your immune system. It is the vagus nerve, and most people have never heard of it.