The Nervous System Has 3 Gears. Here is How to Tell Which One You Are In.

A practical guide to understand your window of tolerace and easy somatic practices that actually expand your capacity to heal. 

What is the Window of Tolerance?

The window of tolerance is a term coined by neuropsychiatrist Dan Siegel to describe the optimal zone of nervous system activation. This is considered the space where you can think clearly, feel emotions without being overwhelmed by them, and function in your daily life.

When you are inside your window, you feel regulated, present, and grounded. Able to handle stress without being consumed by it.

When you are outside your window — pushed too far in either direction — your nervous system moves into survival mode. In survival mode, your higher thinking, creativity, capacity and desire for connection, sense of safety — all of it goes offline.

This is biology. It feels like a personal failing.

The width of your window is not fixed. It is shaped by your history. Your attachment experiences, traumas, and accumulated stress. The most crucial piece is that this window of tolerance can be expanded. That expansion is what healing is really about.

The Nervous System Has More than One Gear

It helps to have a basic map of the nervous system. There are 3 states your autonomic nervous system moves between. This is the foundation of Polyvagal Theory, developed by Dr. Stephen Porges in 1994. Once you learn to recognize these states in your own body, everything changes.

Ventral Vagal — The Window

This is your regulated, social, connected state. When you feel safe, you are here. When you feel present, curious, open + eager to engage with the world, you are in a regulated ventral vagal state. That is what healing is moving you toward.

Physiologically, your breathing is deep yet easy, shoulders are relaxed, and eyes are bright and twinkling — connecting to your heart space, or soul.

You can laugh easily, connect, create and problem-solve.

Life feels manageable, maybe even meaningful.

This is your baseline when your nervous system feels genuinely safe. For me, this space is what it feels like to be truly alive and free.

Sympathetic — Fight or Flight

When the nervous system senses threat, real or perceived, it shifts into mobilization — fight or flight. A sense of urgency ignites when we move into this sympathetic state.

You become activated, anxious and on guard; primed to respond. This is a dysregulated state of active self-protection. The restless anxiety, heightened reactivity, underlying irritability, and ongoing hypervigilance live in this space.

Heart rate increases, muscles tighten, your senses sharpen.

This is where I landed for the month I was in graduate school, around the time of the 2024 Presidential election. A professor who triggered me. A commute that dysregulated me before I even pulled out of my parking spot. A hospital field placement with a supervisor whose energy my nervous system immediately flagged as familiar and unsafe. I could feel my years of chronic back pain returning, my neck tightening under stress, and my jaw remaining clenched. My voice shook in class while anti-semitic protests occurred on campus. I had sleep disturbances which is very rare for me. My body was sending me every signal it had, and I became keenly aware that I was outside my window of tolerance — pushed into activation.

Dorsal Vagal — Freeze + Shutdown

When the nervous system decides that fighting or fleeing isn’t possible — when the threat feels inescapable, overwhelming, or prolonged — the nervous system downregulates and shifts into a freeze state or state of collapse. This is also known as dorsal vagal shutdown.

The system essentially powers down to protect you. It is an energy conservation tactic. Instead of the activated, mobilized state; this is a dysregulated state of immobilization.

While fight or flight has many similarities to anxiety, the freeze state mimics symptoms of depression. Feelings of disconnection, apathy, hopelessness, depressed, dissociated and being incapable are predominant in a freeze state. There is a sense of numbness, low energy, fogginess, exhaustion, and inability to concentrate or engage with others.

A flatness may appear in your eyes. You move slower, think slower, and sometimes even speak slower. It feels impossible to cultivate joy and there is this urge to disappear into isolation for self-preservation.

Dorsal vagal is also a historically familiar space for my nervous system. This does not mean there is something fundamentally wrong with me, but my nervous system knows when it needs to do what it is designed to do; which is to move me into shutdown to protect me from unsustainable levels of activation. This happened again this year for the first few months after moving to Denver, after a chaotic stretch of survival mode in the months prior.

The election happened the week after I withdrew from school. The visceral fear of an uncertain future, the collective grief, the societal unrest, it reinforced my nervous system historical data of unsafety and knocked me clean into freeze. I remember leashing my dog, Piper, for a walk that first week and telling her as I put her collar on, the world is not safe outside right now, we have to be quick.

At the time, which feels like a lifetime ago in respect to the state of our country — people were not making eye contact. Everyone was in their own protective silo. We are once again, collectively, outside of our windows of tolerance — in many respects, considering the state of our everyday lives and degree of fear + uncertainty.

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Your nervous system speaks to you constantly. The question is whether you have learned to listen.

Before I understood any of this, I intellectualized everything. I tried to think my way into feeling better. I searched for logical explanations. I talked. I analyzed.

Here is the thing, 80% of communication between body and mind is bottom-up. Your body speaks first and your mind follows. It attaches a story to the communication coming from physiological symptoms from your body, thru your vagal nerve, to your brain. Our autonomic nervous system is millions of years old. It is pre-verbal. It does not respond to logic or language. It responds to sensation.

Which means you cannot think your way to safety. You have to feel your way there. 

Healing happens in the body, not the mind.

We live in a culture that has deeply over-indexed on cognitive approaches to mental health. Talk therapy, journaling, and mindset work are all valuable, all with their place. But none of them can reach the part of your nervous system that holds your survival patterns, because that part is pre-verbal and pre-rational.

The practices that actually expand your window of tolerance are somatic — meaning they work through the body. And the most powerful of them have been available to humans for thousands of years. Our ancestors knew this. We are only just remembering it.

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6 Tools to Add to Your Healing Toolbox 

Breathwork

Your breath is the only autonomic function you can consciously control. This makes breathwork the most direct pathway into your nervous system. Slow, extended exhales activate your vagus nerve and signal safety to your body. Box breathing, 4–7–8 breathing, or simply elongating your exhale to twice the length of your inhale can shift your state in minutes.

When I was in activation and a fight or flight state, conscious breathwork was one of the few things that could bring me back.

Vagal Nerve Toning

Your vagus nerve is the superhighway between your brain and your body, and the tone of that nerve determines how quickly you can return to regulation after stress. You can strengthen it deliberately. Humming, singing, gargling, cold water on your face, gentle neck stretches allstimulate the vagus nerve and build your resilience over time. This is not woo-woo. This is neuroscience.

I wrap myself around my dog sometimes while I hum or chant, and she starts to purr like a cat. Instantly soothed and a testament to both vagal nerve toning and co-regulation. 

Bilateral Movement

Movement that alternates between the left + right sides of your body, walking, drumming, EMDR, yoga, activates both hemispheres of your brain and helps discharge stored activation in your nervous system. Read all about bilateral movement here. 

Time in Nature + Sunlight

Our nervous systems evolved in nature, not in fluorescent offices and doomscrolling loops. Time immersed in natural environments measurably reduces cortisol, lowers heart rate, and restores nervous system balance. Morning sunlight specifically helps regulate your circadian rhythm which directly benefits mood + nervous system stability.

I step outside with my dog within 30 minutes of waking. I do not touch any technology before I get outside and I almost always take some time during those 30 minutes to place my feet directly on the Earth. 

Meditation + Stillness

Not the kind of meditation where you try to force your mind blank — the kind where you practice gently returning to the present moment when your mind wanders. Over time, this builds your capacity to stay in your window when life tries to pull you out of it. It trains your nervous system the same way physical training builds muscle.

I meditate immedately after my morning walk. These small tweaks to my own personal routine and have created healthy rituals to set the tone for my day. 

Somatic Awareness

Simply developing a practice of checking in with your body regularly ,  noticing sensation without needing to immediately fix or change it , builds what’s called interoception - inner body awareness. The more fluent you become in your body’s language, the earlier you catch yourself moving outside your window.

I knew something was wrong during those school weeks because I had learned to listen. The shaking voice, the hollow eyes, the sleep disturbances were not random. They were my body’s intelligence speaking.

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Having a regulated nervous system is not a fixed state you achieve; it is a capacity that you develop and work on daily. This expands your natural ability to move between emotional states with increasing flexibility + less fear. With practice, it allows you to return to a regulated state faster than in previous times of dysregulation. You notice the physiological signs sooner.

A regulated nervous system still feels hard things. It still experiences grief, anger, fear, and sadness. What changes is your relationship to those states. They become less threatening. You can feel them without needing to escape them immediately. You can move through them and return to yourself on the other side.

This is why the goal in somatic healing work is never to stop feeling; it is to expand your capacity to feel safely. To widen the window of what is tolerable. The practices that support this are not about switching off difficult emotions; they are about teaching your nervous system that you can be with those emotions without the whole system going offline.