Cyclic sighing: the breath Stanford studied.

There is a small breath you have been doing without noticing. After a long sentence, before a difficult question, between two ideas. A short inhale, a slightly longer one stacked on top, then a long exhale that makes its own quiet sound. The body does it on its own, when it remembers to. In 2023, a team at Stanford gave that breath a name and ran a controlled trial on it. The result was striking enough that the practice has shown up in everything from podcasts to clinical handouts since.

The technique itself is two sentences long. Inhale through the nose, then take a second short inhale on top to fill the lungs the rest of the way. Then exhale slowly through the mouth, longer than either of the inhales, until the body feels emptied. Repeat for five minutes. There is no kit, no app, no posture required. The whole thing fits in the gap between two meetings or in the moments before sleep.

Why it caught attention is not the technique, which is old. It is the trial. In January 2023, David Spiegel and Andrew Huberman at Stanford published a randomised study comparing four breath practices, including cyclic sighing, against a daily mindfulness meditation. Each practice was performed for five minutes a day, every day, for one month. Cyclic sighing came out on top, both for self-reported mood and for the slowing of the breath itself across the day.1

“It is two sentences long, asks five minutes a day, and shifts how the day feels by the end of the week.”

Why the long exhale is the active ingredient is straightforward. The slow out-breath engages the calmer side of the nervous system, the one that lowers the heart rate and signals that the next moment is safe. Cyclic sighing emphasises that out-breath in a way the body recognises immediately. Within thirty seconds of starting, most people notice a small softening in the chest. Within a few minutes, the breath has slowed on its own.

The reason this fits a busy schedule is its modesty. Five minutes once a day, anywhere, in any setting. Walking from one space to another. Sitting at a desk between calls. In the car after a difficult conversation. The practice does not demand concentration, environment, or training. It asks only for the breath to be redirected for a few minutes.

How it sits next to a longer practice is worth saying. The five-minute version is the daily floor: the small, repeated discipline that keeps the baseline low. A practitioner-led sound session is the periodic deeper version: an hour given over to settling completely. They are doing the same kind of work at different scales. A daily five-minute breath, kept up across weeks, will produce its own slow shift. An hour of sound work, once or twice a month, adds the depth that brief practices cannot reach on their own.

Where to start is unfussy. First thing in the morning, before email. Mid-morning, between two meetings. After a difficult call. Before a difficult one. The Stanford participants did the practice at consistent times each day; what mattered was the consistency, not the moment. A week of five-minute sessions is the smallest meaningful unit.

What to expect after that week is mild. A softer baseline. A slower rise into anxiety in moments that used to spike. A faster return to calm after a difficult exchange. The trial data showed a real effect, but a quiet one. The point of cyclic sighing is not the day you do it. It is the cumulative tuning of the nervous system across the days and weeks you have done it.