Guided cyclic sighing
Physiological Sigh Timer
A physiological sigh is a double inhale followed by a long exhale. Repeating it for a minute or more is called cyclic sighing. Press start and follow the circle: a breath in, a small top-up, then a slow breath out.
Ready when you are
One breath takes 9 seconds. If any part feels like a strain, choose a shorter pace or stop. A comfortable breath matters more than the count.
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The short answer
The physiological sigh is a breathing pattern made of two inhales — a breath in and a smaller second sip of air — followed by a long, slow exhale. Researchers call the repeated version cyclic sighing. In a 2023 randomized study, five minutes of daily cyclic sighing improved positive mood more than mindfulness meditation, and a small 2026 pilot linked one minute of it with short-term drops in anxiety.
How to do a physiological sigh
- Breathe in through your nose until your lungs feel comfortably full, not stretched.
- Without breathing out, take a second, shorter sip of air through your nose.
- Breathe out slowly through your mouth, letting the exhale last longer than both inhales together.
- Repeat for one to five minutes, keeping every breath gentle.
Physiological sigh or cyclic sighing?
Spontaneous sighs are a normal part of breathing: every so often, your body takes a deeper breath on its own. A physiological sigh usually describes doing this on purpose, with a deliberate second inhale on top of the first.
Cyclic sighing simply means repeating that pattern continuously for a set time. It is the repeated version, rather than a single sigh, that has been tested in studies.
What does the research say about cyclic sighing?
A 2023 randomized study compared five minutes a day of cyclic sighing, box breathing, cyclic hyperventilation and mindfulness meditation over about a month. The authors reported that the breathing exercises, especially cyclic sighing, produced greater improvements in positive mood and larger reductions in breathing rate than meditation.
That result has limits. Cyclic sighing did not beat every other group on every measure, and the study looked at daily practice rather than a single sigh in a stressful moment.
A small 2026 pilot study tested about one minute of cyclic sighing, timed at roughly four seconds in, one second in and eight seconds out, when people noticed anxiety in daily life. It was associated with larger short-term drops in anxiety than a passive comparison condition, and box breathing showed similar benefits.
Claims that one or two sighs instantly reset your nervous system go further than the evidence currently supports.
Why two inhales?
The second inhale lets you top up your lungs without forcing one huge breath, and it naturally leads into a longer, unhurried exhale. You do not need to pull in as much air as possible. A small sip is enough.
About the two timing options
The gentle setting, two seconds in, one second in and six seconds out, is the rhythm used in the Reframer app's Quick Release exercise. It is a shorter adaptation of cyclic sighing rather than an exact research protocol.
The longer setting, four seconds in, one second in and eight seconds out, is close to the timing used in the 2026 pilot study. Choose whichever you can repeat without straining.
When the physiological sigh may suit you
- You want a short pattern with a clear sense of release.
- You would rather not hold your breath.
- A long exhale feels natural to you.
- You only have a minute or two.
Breathe comfortably
- A slow breath is not the same as a big breath. If you feel light-headed, tingly or short of breath, take smaller breaths, choose a shorter pace or stop.
- Do not practise breath-hold patterns while driving, swimming or anywhere you need to stay fully alert.
- If you have a heart or lung condition, are pregnant or have been told to avoid holding your breath, check with a healthcare professional first and favour patterns without holds.
- If focusing on your breath makes anxiety stronger, try an outward-focused grounding exercise instead. Breathing is one option, not a requirement.
When your body has settled, what about the thought?
In the Reframer app for iPhone and Apple Watch, breathing is one step in a gentle routine. A quick check-in suggests whether to breathe first or try 60-second haptic tapping, haptics keep time on your wrist so you can close your eyes, and when you feel steadier you can work through the anxious thought itself.
Try a different breathing exercise
Box Breathing
In 4 · Hold 4 · Out 4 · Pause 4
Four equal phases for people who like a clear, predictable count.
4-7-8 Breathing
In 4 · Hold 7 · Out 8
A short inhale, a long hold and an even longer exhale, often used to wind down.
Coherent Breathing
In 5 · Out 5
About six slow breaths a minute with no holds — the simplest steady rhythm.
Related reading
Frequently asked questions
How many physiological sighs should I do?
Research has tested repeating the pattern for about one minute in the moment and for five minutes as a daily practice. One or two sighs can work as a quick pause, but most of the evidence comes from longer sessions.
Is a physiological sigh the same as cyclic sighing?
They use the same double-inhale and long-exhale pattern. A physiological sigh often refers to one deliberate breath, while cyclic sighing means repeating it for a minute or more.
Should I breathe out through my mouth?
Cyclic sighing studies have often used a nasal inhale and a mouth exhale, but comfort matters more than the exact route.
Can I use a physiological sigh when I feel panicky?
Some people find a long exhale easier than a breath hold when anxiety is high. If focusing on your breathing makes physical sensations feel stronger, switch to an outward-focused grounding exercise instead.
Why does the exhale need to be longer?
A long, slow exhale is part of what defines cyclic sighing in research. It also keeps the overall breathing rate slow. Let it be unhurried rather than forced.
References
- Balban MY, Neri E, Kogon MM, et al. (2023). Brief Structured Respiration Practices Enhance Mood and Reduce Physiological Arousal. Cell Reports Medicine.
- Riedl EM, Bracklo T, Wimmer K, Perzl J, Gdynia HJ, Thomas J, Surzykiewicz J (2026). Simply Breathing Anxiety Away? A Pilot, Just-in-Time Ecological Momentary Intervention Study of One-Minute Cyclic Sighing Versus Box Breathing as Tools for Acute Anxiety Reduction and Attention Promotion in Real Life. Anxiety, Stress, & Coping.
For education and self-care. These exercises are not medical advice or a substitute for professional care. If you are in crisis or worried about your safety, contact your local emergency number or a crisis line.