Cyclic Sighing: The Stanford Breathing Study That Beat Meditation for Mood
A Stanford trial found that five minutes of cyclic sighing a day lifted mood more than mindfulness meditation over a month. Here is how it works and how to try it.
There is a particular kind of tired that sitting still does not fix. You close the laptop, you try to meditate, and your mind keeps drafting tomorrow's emails. For years I assumed the problem was me and my attention. It took a short breathing exercise, about the length of a song, to make me suspect that the doorway into a calmer mind is sometimes the body and not the thoughts.
That suspicion has some research behind it. A randomized trial from Stanford, published in Cell Reports Medicine and co-led by psychiatrist David Spiegel and neuroscientist Andrew Huberman, tested a few breathing routines against mindfulness meditation for mood. One of them came out ahead. It is called cyclic sighing, and you can learn it in the time it takes to read this paragraph.
What cyclic sighing actually is
Cyclic sighing is a double inhale followed by a long, slow exhale. You breathe in through the nose until your lungs feel mostly full, then sneak in a second, shorter sniff on top to fill the last bit. Then you let the air out through the mouth, as slowly as you comfortably can, like fogging a window you are trying not to wake.
It borrows from something you already do. Babies, adults who have been crying, and people who have just put down something heavy all produce a spontaneous version of it: a stuttering inhale, then a big sigh. The practice just makes that reflex deliberate and repeats it.
Why the long exhale matters
The physiology is worth a few sentences, because it explains why the exhale is the whole point. Inhaling nudges heart rate up a little; exhaling nudges it down. That swing is part of what happens in the heart-rate variability that clinicians track. Lengthen the exhale and you spend more of each breath in the slowing phase, which is associated with the parasympathetic side of the nervous system, the side that dials arousal down.
The double inhale has a job as well. The small air sacs in the lungs, the alveoli, tend to collapse a bit over the course of ordinary shallow breathing. A second top-off sniff is thought to reopen some of them, which makes the following exhale a more effective release of carbon dioxide. I would treat that mechanism as a plausible explanation rather than a proven one; what the trial measured was outcomes, not each step of that chain.
What the Stanford trial did
The study, published in 2023, randomly assigned 108 participants to one of four daily five-minute practices for a month: cyclic sighing, box breathing, cyclic hyperventilation with breath retention, or mindfulness meditation. People did the practice at home and reported their mood each day, along with measures such as anxiety and, in some cases, physiology like resting breathing rate.
All four groups improved. That deserves emphasis, because it is easy to read the headline and conclude meditation failed. It did not; people who meditated for five minutes a day felt better. What the researchers found was that the breathing groups improved more on daily positive mood, and cyclic sighing improved it the most. The sighing group also showed a drop in resting respiratory rate over the month, which suggests the practice was shaping baseline breathing and not just a moment of calm.
More days, more benefit
The finding I find most useful is the dose-response one. According to the authors, benefit tracked with consistency: the more days people practiced, the larger the mood gain tended to be. That is an unglamorous result, and also an honest one. It means the effect is not a one-off trick you perform during a panic. It builds the way strength builds.
It also changes how I would use it. A five-minute practice done on twenty-five of thirty days is worth more than a heroic twenty-minute session done twice. If you are weighing whether to start, that is the part to hold onto.
A grain of salt
A few honest caveats. The sample was 108 people, which is respectable for this kind of study but not large. Mood was self-reported, so expectations can matter. The differences between the breathing groups and meditation were real but modest, not a miracle. And a month is a short window; we do not know from this trial how the effect holds across years.
I sit for Heartfulness meditation, and reading the study did not make me think I should drop it. It made me think of the two as different tools. Meditation, for me, is about learning to rest in attention. Breathwork is closer to a lever I can pull directly. On a day when my mind is too loud for sitting, the lever works better.
Why this study keeps getting cited
Breathwork is having a moment, with studios pairing it with cold plunges and sold as part of a broader recovery routine. Much of that world runs on testimonials and confident claims. This trial is one of the few anchors in it that is peer-reviewed, randomized and comparative. That is why people keep returning to it, and also why it is worth reading carefully instead of quoting loosely: it supports a simple, free, five-minute practice, not the whole expensive ecosystem built beside it.
A five-minute cyclic sighing script
Set a timer for five minutes. Sit or lie down, with your shoulders loose. You can read the steps once and then close your eyes.
- Minute 0 to 1, get the shape. Breathe in through your nose. Before you exhale, take a second, shorter sniff to top off. Then breathe out through your mouth, slowly and fully, as if sighing. Do this a few times just to learn the rhythm.
- Minute 1 to 3, lengthen the exhale. Keep the double inhale small and easy. Let the exhale grow until it is clearly longer than the inhale, without strain. If you run out of air early, shorten it; the goal is comfort, not a record.
- Minute 3 to 4, soften. Drop your jaw and your tongue away from the roof of your mouth. Let the sigh get a little lazier. Notice where the breath lands in your body.
- Minute 4 to 5, return to normal. Let the pattern go and breathe naturally for the last stretch. Watch how your chest and belly move on their own.
Do it at the same time each day, tied to something that already happens: after brushing your teeth, before you open email, or while the kettle heats. If you feel lightheaded, stop and breathe normally. If you have asthma, a heart condition, or are pregnant, check with your clinician before starting any new breathing practice. This is general information, not medical advice.
FAQ
Is cyclic sighing better than meditation?
In this trial it raised daily mood more than mindfulness meditation did, but meditation also helped, and the gap was modest. They are different skills, and many people do well with both.
How long before I notice a difference?
Many people notice a short-term calming effect in the first session. The trial's larger mood gains accumulated over a month of daily practice, so give it at least a few weeks.
Do I have to breathe in through my nose?
The standard version uses a nasal inhale and an exhale through the mouth. If your nose is blocked, a gentle mouth inhale is fine; the long exhale is the part that matters.
Can I do it when I am anxious in the moment?
Yes, a few rounds can help take the edge off. Keep the breaths gentle, though, and stop if you feel dizzy.
Is it safe for everyone?
For most healthy people it is a mild practice. Anyone with a respiratory or cardiac condition, or who is pregnant, should ask their clinician first.
Next time your mind will not settle, try letting the exhale go a little longer than feels natural, and see what the rest of you decides to do.