Cyclic Sighing

Stanford's top-ranked stress relief — works in a single breath

What Is Cyclic Sighing?

Cyclic sighing is a breathing pattern studied at Stanford University that outperformed mindfulness meditation for reducing stress and improving mood in a 2023 clinical trial. The technique uses a "double inhale" — a full breath in followed by a short top-off sip of air — then a long, slow exhale.

Your body already does this naturally. When you sigh spontaneously — after crying, before sleep, during relief — your brain is using the same mechanism to pop open collapsed alveoli in your lungs and dump excess CO2. Cyclic sighing makes this instinct deliberate.

The Science

The double inhale maximally inflates the lungs, including the small air sacs (alveoli) that tend to collapse under shallow breathing. This dramatically increases the surface area available for gas exchange. The long exhale that follows expels a large volume of CO2 in one cycle, which directly signals the vagus nerve to slow the heart.

Research:

In a randomised controlled trial (Balban et al., Cell Reports Medicine, 2023), five minutes of daily cyclic sighing reduced self-reported anxiety and improved positive affect more effectively than mindfulness meditation over a 28-day period.

How To Do It

1. Inhale (3 seconds)

Breathe in deeply through your nose, filling your lungs most of the way.

2. Top Off (2 seconds)

Without exhaling, take a second short sip of air through your nose to completely fill your lungs. You should feel your chest expand fully.

3. Exhale (6 seconds)

Let all the air out slowly through your mouth. Make the exhale long and smooth — at least twice the length of your inhale.

Tip: Even a single cyclic sigh can reset your stress response. For a full practice, repeat for 5 minutes (about 10 cycles). This is the technique to reach for when you need the fastest possible relief.

Benefits

  • Fastest stress relief — measurable calm in under one minute
  • Better than meditation — outperformed mindfulness in Stanford trial
  • Mood boost — increases positive affect, not just reduces negative
  • Natural mechanism — amplifies something your body already does
  • No learning curve — effective from your very first attempt

When To Use It

Cyclic sighing is your emergency calm-down. Use it when anxiety spikes, before a stressful event, after an argument, or any time you need to shift your state fast. It also works well as a 5-minute daily practice to build baseline resilience.