physiological sigh
breathing
prebötzinger complex
The Physiological Sigh: The Double-Inhale Reset Built Into Your Brainstem
That involuntary double inhale — a second little sip of air on top of a full breath, followed by a long exhale — is not a random hiccup. It is a hardwired physiological reset generated by a circuit in your brainstem, and you can trigger it deliberately. It may be the single fastest voluntary lever you have on your own nervous system.
By VagusSkool Team
Jul 22, 2026