Yes, there seems to be a direct link between your tongue and feeling relaxed
This article explores an astrologer's claim that Khecari mudra (or mewing), a yoga practice involving tongue placement, can reduce overthinking in 10 seconds. While a neurologist confirms that tongue position can influence the nervous system, they clarify the specific technique. The correct tongue placement involves curling it back to touch the soft palate, not the nasal cavity. This activates the anterior cingulate cortex, reducing anxiety and overthinking. Another technique mentioned is...
Source: indianexpress.com