The physiological sigh: the fastest way to calm down

If you have ever watched someone stop crying and settle, you have seen a physiological sigh: a deep breath, a second smaller sip of air on top, then a long release. Your body already does this on its own to reset. You can also do it on purpose, and it may be the quickest way to bring yourself down a notch.

How to do it

1. Breathe in through your nose until your lungs feel fairly full.
2. On top of that, take a second, shorter sniff of air to top them off.
3. Let it all out slowly through your mouth, taking longer on the exhale than you did on the two inhales combined.

That’s one sigh. Do a few in a row. Notice whether your shoulders drop a little on each exhale.

Why the double inhale matters

That second sip of air is doing real work. The deep parts of your lungs have tiny air sacs that tend to collapse when you are tense and shallow-breathing. Because a sigh draws in more than twice the air of a normal breath, that extra inhale helps reopen them and keep the lungs working well.² A fuller reopening lets the long exhale clear out more carbon dioxide. The slow release then tips you toward the calming side of your nervous system, the same mechanism behind slower breathing in general.

What the research shows

In a 2023 controlled study, researchers compared three short breathing practices and a mindfulness meditation, five minutes a day for a month. The standout was cyclic sighing, the repeated double-inhale-long-exhale pattern above. Of the practices tested, it gave the biggest lift in mood and the sharpest drop in resting breathing rate, a sign of reduced physical arousal.¹

It is a small, early study on healthy adults, so treat the specifics lightly. The direction still lines up with the wider evidence on slow, exhale-weighted breathing, and the practice costs you nothing to try. The next time your chest feels tight, sigh on purpose.