The physiological sigh
Two inhales through the nose, one long exhale.
Do this
- Inhale through the nose. Without exhaling, take a second short inhale to fill the lungs completely.
- Exhale slowly through the mouth until your lungs are empty.
- One to three rounds is enough in the moment. Five minutes a day builds the skill.
- In the first 20–30 seconds of a stress spike your judgment is at its worst. Say nothing and send nothing until it passes.
- Awake at 3 am? Do ten long exhales before anything else.
On a bad day: One sigh before you answer a stressful message.
Why it works
The second inhale reopens small air sacs in the lungs that have collapsed, so the exhale that follows clears more carbon dioxide. A long exhale also slows the heart through the vagus nerve. Together they bring arousal down within seconds.
What the research says
One randomized trial, run in his own lab, with about 110 people over a month. Five minutes a day of this breathing improved mood more than mindfulness meditation and lowered resting breathing rate. The effects were modest and self-reported. The claim that a single sigh works at once comes from his observation, not from that trial.
- Balban et al., Cell Reports Medicine, 2023Brief structured respiration practices enhance mood and reduce physiological arousalCompared three five-minute breathing practices with mindfulness meditation. Exhale-focused cyclic sighing gave the largest daily gain in positive mood.
- Li et al., Nature, 2016The peptidergic control circuit for sighingIdentified the small group of brainstem neurons that turns a normal breath into a sigh, in mice.
Watch out
Stop if you feel dizzy. Don't practise forceful breathing in water or while driving.