Daily movement

Physiological Sigh

A rapid, natural breath pattern to immediately reduce acute stress and reset the nervous system.

Physiological Sigh

A rapid, natural breath pattern to immediately reduce acute stress and reset the nervous system.

Physiological Sigh (Stress Reduction Protocol) · First described by Jack Feldman, Ph.D., and later popularized by Andrew Huberman, Ph.D., this breathing pattern is an innate human and mammalian stress physiological response. · Acute stress, anxiety, overwhelm, difficulty falling asleep, feeling constricted or "stuck" in a state of high arousal. · Perform 1-3 physiological sighs in a sequence. Repeat this sequence whenever acute stress or anxiety arises. For sleep, perform 2-5 sequences before bed.

Why it works

The physiological sigh involves two rapid inhales through the nose followed by a long, slow exhale through the mouth. The double inhale completely reinflates collapsed alveoli (tiny air sacs in the lungs), maximizing oxygen intake. The extended exhale then expels carbon dioxide efficiently. This rapid exchange lowers CO2 levels, shifting the autonomic nervous system from sympathetic (fight-or-flight) dominance to parasympathetic (rest-and-digest) dominance, leading to an immediate reduction in heart rate and an increased sense of calm.

How to practice

  1. First Inhale: Take a deep, full inhale through your nose, filling your lungs as much as possible.

  2. Second Inhale: Without exhaling, immediately take a second, shorter sharp inhale through your nose, drawing in even more air, feeling a maximal stretch in your diaphragm and chest.

  3. Exhale: Slowly and completely exhale through your mouth, making the exhale as long and deliberate as possible, letting out an audible sigh or "haaa" sound. Imagine truly "letting go" with the exhale.

  4. First Inhale: Take a deep, full inhale through your nose, filling your lungs as much as possible.

  5. Second Inhale: Without exhaling, immediately take a second, shorter sharp inhale through your nose, drawing in even more air, feeling a maximal stretch in your diaphragm and chest.

  6. Exhale: Slowly and completely exhale through your mouth, making the exhale as long and deliberate as possible, letting out an audible sigh or "haaa" sound. Imagine truly "letting go" with the exhale.