Protocol

Physiological Sighing

Two quick breaths in through the nose, then one long slow breath out through the mouth, repeated for about five minutes. Also called cyclic sighing.

EffortVery easy
CostFree
Time1–5 min
Best timeAny time you feel tense

Pairs well withMindfulness Meditation, L-Theanine, Resonance Breathing

Evidence-backed benefits

How Physiological Sighing can help, goal by goal, with the studies behind each score.

Stress & Anxiety

13XP

In one randomised study, five minutes a day of cyclic sighing for a month improved mood and slowed breathing more than mindfulness meditation did.

Studies1

How to read XP

Each score is for this protocol and that specific goal, not a general rating.

XP combines how reliable the research is with how much difference it usually makes. Higher means stronger evidence for that protocol and that goal.

Limited<15 XPModest15–27 XPModerate28–44 XPReliable45–69 XPHigh70+ XP

How to do it

When you feel stressed, or for five minutes at a set time each day.

1
Sit or stand comfortably
Relax your shoulders.
2
Breathe in through your nose
Fill your lungs most of the way.
3
Take a second short sip of air
Another quick inhale through the nose to top up.
4
Breathe out slowly through your mouth
Make the exhale long and unhurried, longer than the inhale.
5
Repeat for 1–5 minutes
The study used five minutes a day.

The good-enough version

Three to five rounds whenever you feel tension building.

Common mistakes

Forcing the breath
Making the exhale short
Doing it while driving or in water
Mixing it up with fast hyperventilation

Your journey

You may feel calmer within a few minutes. The study measured effects after a month of daily practice. An estimate from the studies' timelines, not a promise: everyone responds differently.

Stress & Anxiety

Day 1 → Week 4

From the first noticeable effect to roughly full strength. Colour follows the XP tier of each benefit.

Make it a habit

These gains come from steady use, not a single dose. Keep Physiological Sighing in your routine for about week 4 before you judge it.

Safety

What to know before you try Physiological Sighing.

Safety rating

Well tolerated

Mild effects, if any.

Keep it gentleKeep the breaths easy. Stop and breathe normally if you feel dizzy.
Early evidenceThe main evidence is one randomised trial, so treat the benefit as promising, not proven.

Check with a doctor first if you have asthma, COPD, a heart condition or panic disorder, or feel dizzy when you breathe deeply.

General information, not medical advice. If you are pregnant, take medication or have a health condition, check with a doctor or pharmacist first.