Two inhales through the nose, the second a small top-up, then one long exhale through the mouth, as if fogging a mirror. That is the physiological sigh and it works in about four seconds. Do it once or twice, then let the next few breaths go out longer than they come in.
The steps
- Inhale through the nose until the lungs feel full.
- Sneak in a second, smaller inhale on top.
- Exhale through the mouth, slowly, all the way out. Let it take twice as long as the inhales.
- Repeat once. Then breathe normally with the out-breath slightly longer than the in-breath for a minute.
- If you can, drop your shoulders and unclench your jaw on the next exhale.
When not to, and when to get help instead
Not while driving; pull over first. If the double inhale feels uncomfortable, which it sometimes does during panic, use a single slow inhale and a long exhale instead. If spikes like this are frequent or come with chest pain, see a doctor; the breath is a tool, not a diagnosis.
What the research says
The body produces a sigh on its own every few minutes to re-inflate the lungs, and doing it on purpose drops arousal quickly. A 2023 Stanford trial found five minutes a day of it improved mood over a month more than mindfulness did, and a 2025 pilot found four minutes of it eased pain in a clinic waiting room. The long exhale underneath it is where the vagus nerve applies the brake; two small studies found a longer exhale changes how relaxed people feel independent of pace.
Other methods people use
Box breathing (four in, hold, four out, hold) steadies people who have to sit still, and the holds are skipped by anyone with panic. 4-7-8 is a long exhale with a long hold, mostly used for sleep. Coherent breathing at six a minute is the same pace I teach, with a bigger trial literature behind it. Alternate-nostril breathing works for people who like a hand task. All of them share the slow exhale; pick the one you will actually do.
Questions people also ask
How fast does the physiological sigh work?
Most people feel the first drop within one or two sighs, inside ten seconds. If it does not move the needle, do a Soundcheck and find where you are bracing; the breath cannot reach a jaw you are holding shut.
Why do I feel worse when I try to take a deep breath?
Because a big inhale is the wrong direction. Anxiety is already an inhale posture. Make the exhale the long part and the inhale small.
In the book
Techniques
Rooms
Two rules, no exceptions
Never practice any technique on this site while you are driving, operating machinery, or doing anything that needs your full attention. The slow ones can make you drowsy, faster than you’d expect. And never practice a breath-hold, bellows breath, or any vigorous breathing in or near water. Read Before you begin for the doctor’s list and the rest.
More in “Right now”
- What breathing helps during a panic attack?
- How do I stop shaking when I'm nervous?
- How do I breathe when I'm angry and about to say something I'll regret?
- How do I breathe after bad news?
Written by Eric Bradley. Last reviewed October 2026. One performer’s craft, offered for general information; not medical advice, mental health treatment, or a substitute for care.