The Physiological Sigh: A 60-Second Reset
Two quick inhales, one long exhale. The fastest evidence-backed way to calm your body, straight from Stanford research.
Check-in
How stressed does your body feel right now?
You already do this in your sleep. The physiological sigh, a double inhale followed by a long exhale, is your body's built-in reset switch, and it fires automatically when carbon dioxide builds up or after crying.
In 2023, Stanford researchers led by David Spiegel and Andrew Huberman compared breathing techniques head to head in a month-long study. Five minutes of deliberate cyclic sighing per day improved mood and lowered resting breathing rate more than mindfulness meditation did.
The mechanism: the second, smaller sip of air pops open collapsed air sacs in your lungs so more carbon dioxide can leave on the long exhale, and the slow exhale itself taps the brake on your heart rate.
Breathing exercise
Inhale through your nose, then take one more short sip of air on top. Let it all out slowly through your mouth, like fogging a mirror.
Cycle 1 of 5
Check-in
Five sighs later: how does your body feel?
Quick quiz
What does the second, short inhale actually do?
In the moment, even one to three sighs takes the edge off. For a mood effect that compounds, the Stanford protocol was five minutes of repeated cycles once a day.
