Vagal tone refers to the acticitu and responsiveness of the vagus nerve which is the longest cranial nerve in the body. The vagus nerve plays a big role in the autonomic nervous system which controls involuntary bodily functions like heart rate, digestion, respiratory rate. Vagal tone is an indicator of how efficiently the vagus nerve functions. A high Vagal tone suggests that the vagus nerve is well regulated and responsive. It is associated with better emotional regulation, stress resilience,