Physiological Sigh (Double Inhale Breathwork)

Stanford neuroscientist Andrew Huberman and his colleagues identified this double-inhale breathing pattern—a full nose inhale, a short top-up inhale, then a long slow mouth exhale—as a mechanism that re-inflates collapsed alveoli caused by shallow stress breathing. In a 2023 Cell Reports Medicine RCT, subjects practicing the Physiological Sigh showed greater improvements in mood and reduced physiological arousal than those using other breathwork patterns or mindfulness meditation. It requires no equipment, training, or privacy, making it an accessible acute stress tool for professional or social settings.