If you've ever wanted to understand your nervous system,
This is it,
All in one place.
I touch on pieces of this across several of my courses,
But I wanted to bring it all together for you here,
Once.
Think of it as a nervous system 101.
How your body drives more than your mind does,
And a simple map,
The window of tolerance,
That will help you understand your own ups and downs with a lot more clarity,
And hopefully,
A little more compassion.
One of the most powerful ways to connect with yourself is through an awareness of and respect for your nervous system.
This is because humans are bottom-up beings.
80% of the messages sent through the vagus nerve,
Our information superhighway,
Travel from the body to the brain.
While only 20% travel from the brain to the body.
Put simply,
Our body is in the driver's seat,
Not our mind.
And if we want to feel at ease in our bodies,
Clear in our minds and open in our hearts,
We need to spend time inviting a sense of regulation into our nervous system.
A skillful way to understand this is through a concept called the window of tolerance developed by Dr.
Dan Siegel.
A clinical professor in psychiatry.
It's now widely used to help children,
Adults,
Schools,
Workplaces and health professionals understand our optimal zones of arousal and emotional regulation.
The state where we can function well and actually thrive.
Think of your window of tolerance as your optimal zone.
The place where you feel grounded,
Flexible,
Open and present.
From here,
You can regulate your emotions.
Interact with others in healthy ways,
And tolerate and bounce back from life's stresses.
This is also where you have the clearest access to your wise,
Compassionate,
Insightful self.
Here's something worth sitting with for a moment.
Think about the last time you truly felt like yourself.
Calm,
Clear,
Able to handle whatever came up.
What was different about your body in that moment compared to right now?
When we experience internal and external stresses,
It's easy to move out of this optimal zone into either hyperarousal or hypoarousal.
Hyperarousal,
Moving above your window,
Is your sympathetic nervous system's fight-or-flight response.
And a genuinely healthy,
Intelligent part of being human.
We need it for real threats,
A near miss on the road,
A medical emergency.
And it also shows up as a healthy activation,
Speaking up for something you care about,
Meeting a deadline,
Advocating for someone you love.
The trouble is,
This alarm can stay switched on for weeks or months after the danger has passed.
Becoming a low-level background hum running through daily life.
Rushing through the morning.
Tension the moment you open your inbox.
Snapping at someone you love.
Lying awake at night unable to switch off.
Nothing is wrong in this exact moment,
But your body is responding as if something is.
This too hot state can show up as anxiety,
Irritability or agitation.
Being oversensitive to bodily sensations or our surroundings.
Hypervigilant.
Hyperreactive.
Life can feel chaotic,
Like we're bouncing from one drama straight into the next.
A body in survival mode doesn't naturally orientate towards possibility.
It orientates towards protection.
Scanning for danger,
Solving,
Controlling,
Bracing,
Preparing.
Stay here for too long and it shows up as haste rather than thoughtfulness.
Defensiveness in our relationships.
A restless sense of impending doom.
And real difficulty finding satisfaction.
Hypoarousal,
In contrast,
Is when we move below the window of tolerance.
An immobilization response,
Sitting with the parasympathetic nervous system.
This can feel like shutdown,
Apathy,
Disconnection,
Numbness or disassociation.
We take less action.
We can experience an absence of inner sensations altogether.
This state often carries with it its own inner commentary.
What's the point in trying?
Things never work out for me anyway.
Or I can't be bothered going out with my friends.
I always feel misunderstood.
There can be a sense of hopelessness,
Guilt,
Shame or disconnection sitting underneath this state.
Like hyperarousal,
This state has an evolutionary function too.
It protects us when we're overstimulated or when an emotional experience feels like too much.
But stay here for too long and it starts to strain our relationships,
Our work and our sense of self.
When we're in our window of tolerance,
We have access to our prefrontal cortex and our executive functioning.
The ability to organize,
Plan,
Prioritize,
Regulate emotion and problem-solve as challenges arise.
Step outside the window and we lose access to that part of the brain.
We may default to panicked,
Ill-considered or misaligned action.
Or no action at all.
Gravitating towards patterns and choices that erode our relationship with others,
With ourselves and the world.
It's worth acknowledging that people with relational trauma histories often have a smaller window than those without.
This is a natural result of what they've lived through,
Not a personal failing.
New research also suggests that trauma can be passed down through the nervous system across generations.
And that neurodivergent people,
Along with some people living with chronic pain,
May also carry a naturally smaller window.
What I love about understanding the nervous system is that it shifts the inner narrative from what's wrong with me to ah,
This is a human nervous system doing exactly what it's designed to do.
That shift alone can create space.
Self-compassion.
And hope.
If you'd like to spend some time inside your window of tolerance,
Rather than just thinking about it,
There's a guided practice called the River of Regulation.
It's built to help bring your nervous system back into that steady resource place we've been talking about today.
