18/08/2026
Why do we sigh?
We all do it. Sometimes without even noticing. More than something that is done in moments of frustration, a sign activates and heals the nervous system by stimulating the vagus nerve.
A big deep sigh reinflates tiny air sacs in the lungs that can become under-inflated during normal breathing, helping to keep the lungs working efficiently.
Sighing brings in more oxygen. It tells your body you are safe, it is your rest button, triggering the parasympathetic nervous system; our relax and repair mode.
There is also an interesting breathing practice based on the physiology of a sigh.
Try this:
- Take a normal breath in through your nose.
- Then take a second, smaller breath in.
- Follow it with a long, slow exhale through the mouth.
- Repeat for a few minutes, without forcing the breath.
This is known as a physiological sigh.
Sometimes your body is simply adjusting your breathing.
📸 thank you to Benjamin Child for the image via unsplash