Stress relief

Physiological Sigh

Stanford's fastest way to calm down

The physiological sigh — researched at Stanford by Andrew Huberman — is a double inhale followed by a long exhale. Your body already does this involuntarily during sobbing and right before falling asleep. Done deliberately, it is the fastest known way to drop physiological stress.

Why it works

The second short inhale reinflates alveoli that collapse during stressed shallow breathing. The long exhale offloads accumulated CO₂. Studies at Stanford and elsewhere show measurable mood and anxiety improvement after just five minutes a day. Faster onset than meditation, yoga, or visual mindfulness for acute stress.

How to do it

1. 1 Inhale deeply through your nose to fill your lungs.
2. 2 Without exhaling, take a second, sharper inhale through your nose to top off your lungs.
3. 3 Exhale slowly and completely through your mouth — twice as long as the inhale.
4. 4 Repeat 1–3 times for in-the-moment relief, or for 5 minutes for deeper effect.

When to use physiological sigh

• Acute stress spike (bad news, conflict, performance pressure)
• Between meetings to reset
• When you only have 30 seconds
• Pre-sleep wind down

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