The vagus nerve is a critical component of nervous system regulation. It is the longest nerve in your body, running from the base of your brain to the bottom of your spine, and is responsible for calming the body after a stressful event. Activating the vagus nerve can help reduce heart rate and blood pressure, promoting relaxation. Some ways you can stimulate your vagus nerve include yawning, swallowing, and humming. Polyvagal yoga is another effective technique that promotes vagus nerve activation through specific yoga poses and breathing exercises. By activating the vagus nerve, you can expect to feel more centered and regulated.