The physiological sigh

Breathe in through your nose, take a short second sip of air on top, then let it all out slowly through your mouth. That's the physiological sigh, and it takes about ten seconds.

The pacer uses a gentle 2-1-6 rhythm: two seconds in, a one-second top-up, then a six-second exhale. If that's too fast or slow, ignore the numbers and keep the shape: two inhales, one longer exhale. With reduced motion on, the circle stays still and the text guides you. It all runs on this page, and nothing is sent anywhere.

How to do it

1. Breathe in through your nose. A full, easy breath, most of the way to full.
2. Take a second, shorter inhale on top. A quick sip through the nose, as if topping up the last bit of space.
3. Breathe out slowly through your mouth. Let it be long and unhurried, longer than the two inhales together.
4. Repeat. One to three sighs for a quick reset, or a few minutes of continuous sighing.

You don't need to sit perfectly or close your eyes. That's one reason this pattern is popular: you can do a couple of sighs at a desk, in a queue or in the car while parked, without anyone noticing.

Why the double inhale?

You sigh naturally many times an hour without thinking about it. A spontaneous sigh is a bigger-than-usual breath, often with a second inhale stacked on top, and it helps re-open parts of the lungs that don't fully inflate with small breaths. The practiced version copies that shape and then adds a deliberately long exhale.

The long exhale is the part most people notice. Like 4-7-8, it spends more time breathing out than breathing in. Unlike 4-7-8 or box breathing, there's no hold, which makes it a comfortable option if breath holds don't suit you.

What one study found

The best-known research is a remote, randomized study published in Cell Reports Medicine in 2023 (Balban and colleagues, Stanford). Healthy adults did five minutes of one practice every day for a month: cyclic sighing, box breathing, cyclic hyperventilation with breath retention, or mindfulness meditation for comparison.

The researchers report that the breathing practices, especially exhale-focused cyclic sighing, produced a greater improvement in mood and a larger drop in breathing rate than mindfulness meditation did. They describe daily five-minute cyclic sighing as a promising way to manage everyday stress.

Keep the limits in mind. It was one study, in healthy volunteers, over a single month, with mood measured by questionnaire. It doesn't show that sighing treats any condition. What it does suggest is that a five-minute daily practice is a reasonable thing to try, and that you don't need a long session for it to feel worthwhile. You can read the paper via its DOI: 10.1016/j.xcrm.2022.100895.

Sighing vs fast breathing

The physiological sigh uses big breaths, but it's slow. Each cycle takes around ten seconds, and the long exhale keeps the pace down. That's very different from power breathing, where you take 30 to 40 quick, deep breaths in a row before a hold. If you notice tingling or light-headedness while sighing, you're probably going too fast or taking the inhales too deep. Slow the exhale and make the inhales smaller.

Tips

• Make the exhale the focus. If you only remember one thing, make the breath out long and slow.
• Keep the top-up small. The second inhale is a sip, not another full breath.
• Don't speed up. Rapid sighing can make you light-headed. If you feel dizzy, breathe normally.
• Pair it with a moment. A sigh before you reply to a stressful message, or before you start the car once you're parked, is easy to remember.

In Simple Breathwork

The Physiological Sigh is one of the guided sessions in Simple Breathwork, alongside Box Breathing and 4-7-8. Each phase is guided with haptics and soft tones, so you can follow the double inhale and long exhale with your eyes closed, on iPhone or Apple Watch. With Apple Health turned on, the session is saved as Mindful Minutes.

New to all of this? The beginner's guide explains how the different patterns fit together, and the free two-minute reset is a good place to start each day.

General wellness information, not medical advice. Simple Breathwork is not a medical device. Breathing exercises and breath holds can cause dizziness, tingling or fainting: practice seated or lying down, never in or near water, while driving or standing. If you are pregnant or have a heart, lung, seizure or other health condition, talk to a doctor first.