The trigeminal nerve endings inside the nostrils are exquisitely sensitive to airflow, temperature, and pressure. Focusing on this sensation provides a potent, non-conceptual anchor to the present moment, bypassing cognitive loops.
This specific focus activates the insula, the brain's interoceptive hub for mapping internal body states. A strong insula is linked to better emotional regulation and reduced reactivity.
In yogic traditions (pranayama), feeling the breath at the tip of the nose (nasikagra drishti) is a foundational practice for steadying the mind. Modern biofeedback therapy uses similar nasal breath awareness to reliably lower heart rate variability.
Each nostril cycles through dominance every few hours, influencing which brain hemisphere is more active. Noticing which side feels more open can reveal your current physiological state.