The Vagus Nerve: Your Body’s Rest Nerve

Does this sound familiar? You’re in a conversation and before anything’s been said, your body already knows something’s off. Your shoulders rise, your breath grows shallow. Or you go to a party you were genuinely looking forward to, and for reasons you can’t explain, you just can’t settle.

How does this work? A nerve runs through your body that registers this kind of thing long before you have words for it. This nerve senses your heartbeat, your breath, your gut, the tension in your throat, and the expression on your face. And it sends all of that upward, to your brain, usually without you noticing.

This nerve is called the vagus nerve.

A wandering nerve

Vagus is Latin for wandering, and the name fits. The vagus nerve starts in your brainstem, runs past your throat and vocal cords, past your heart and lungs, through your diaphragm, and all the way into your gut. It’s the longest nerve in your autonomic nervous system, the part that works without you having to think about it.

Your body talks back

Here’s something that surprises a lot of people. We tend to assume our brain is in charge and the body just carries out orders. With the vagus nerve, it’s largely the other way around. Most of the information travelling along this nerve goes upward: from your body to your brain, not the reverse.

Your body is constantly reporting. And your brain is listening.

This is exactly why simply thinking about calm doesn’t make you calm. You can’t reason your way into it.

Safety is something you feel, not something you decide

Researcher Stephen Porges described how the vagus nerve relates to the feeling of safety. According to his polyvagal theory, your nervous system is constantly switching between states, mostly outside your awareness. On one side, alertness and tension. On the other, a state of calm, presence, and connection, linked to a specific branch of the vagus, the ventral vagus.

Worth knowing: polyvagal theory is a model, a way of looking at things. Not every part of it is equally well proven. But as a lens for understanding why you feel on edge around one person and naturally calmer around another, it’s surprisingly useful.

And then there’s yawning. Yawning during a Yin class is sometimes seen as a sign someone’s bored. In reality it’s often the opposite. Yawning appears to be linked to that same ventral system that signals your nervous system shifting back to rest. If you yawn as you finally slow down, that’s usually a good sign. Your body is letting go.

The vagal brake, and how to use it yourself

Porges calls the calming effect of the ventral vagus a brake. A vagal brake. Your nervous system can accelerate when needed, and slow down again once it’s safe enough. For many people who’ve lived on tension for a long time, that brake has grown a bit stiff. Not broken, just underused.

The good part is that you can practise that brake. And you need nothing but your breath. The key lies in your exhale. On the inhale, your heart rate speeds up slightly, on the exhale it slows. By consciously making your exhale longer than your inhale, you invite that vagal brake to do a bit more work.

LAND · BREATHE · FEEL

LAND, BREATHE, FEEL is the method I developed myself: not a quick fix, but a path you can return to for your whole life. When you work with it, as I do in my trainings and in my own practice, you see the vagus nerve showing up everywhere.

Whether Yin Yoga works precisely through the vagus or through the nervous system’s broader relaxation response isn’t always something science can trace down to the last nerve cell. What’s clear is this: working slowly, holding long, and taking the time to feel brings your body into a state where recovery becomes possible.

You don’t need to understand this nerve to benefit from it. You only need to give it the room to do its work. And that usually starts with one thing: exhaling slower than you’re used to.