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One of the simplest ways to calm your nervous system is something you can do anywhere, anytime, for free. It's called the physiological sigh. Here's how to do it: 1 Take a deep inhale through your nose. 2 Take a second, shorter inhale to top it off. 3 Slowly exhale through your mouth, making the exhale longer than the inhales. Repeat 3–5 times. This breathing pattern can help reduce feelings of stress and bring your body toward a calmer state.