physiological sigh

A physiological sigh is a deep inhale, a second brief inhale, then a long, extended exhale. It can quickly reduce stress and help restore calm. 1

• How it works: The second inhale helps reopen small air sacs in the lungs; the long exhale helps clear carbon dioxide. 2
• When it happens naturally: People do physiological sighs spontaneously, awake or asleep, including around breath-holding or when carbon dioxide builds up. 3
• When to use it: Try one during acute stress or anger, or before a nerve-inducing situation such as public speaking. 4