The nervous system is something we’ve all heard about, and something we know can be complex.

Yet somehow, a lot of the conversation around it has been shortened down to a pretty simple formula:

Stay calm.

But is staying calm something we can constantly achieve?

Or, better yet, is it something we actually want to achieve all day, every day?

If we look at some of the key terms that have become part of the nervous system conversation, we see things like:

Nervous system regulation
Dysregulation
The vagus nerve
Cortisol
HRV
Fight, flight and freeze
Window of tolerance

Some of what you’ve heard about these topics comes from legitimate science.

Some of it has been simplified for social media.

And some of it has moved considerably further than the evidence actually supports.

That’s what makes this topic so interesting.

These terms carry a lot of weight and meaning because they are connected to how our bodies respond, adapt and function every single day.

And the more I’ve dug into this subject, the more I’ve realized just how easy it is to take something that is scientifically accurate and turn it into something that is much simpler than reality.

I’m not a neuroscientist.

And I’m not trying to turn this into a neuroscience textbook.

My goal here is much simpler.

I want to take some of these complicated ideas, break them down into language that actually makes sense, and look at what we know, what has been simplified, and where some of the popular nervous system advice starts to lose context.

Because understanding your nervous system isn’t about learning a bunch of complicated terms.

It’s about understanding what your body is actually doing.

Your Nervous System Isn’t Trying to Keep You Calm

One area I had to dive deeper into understanding was the sympathetic and parasympathetic nervous systems.

These are two important parts of the autonomic nervous system, but they are often taken out of context.

We’ve been led to think of them almost like this:

Sympathetic = Bad

Parasympathetic = Good

But this just isn’t the case.

Both play crucial roles every day, and both have jobs that we rely on.

Let’s start with the sympathetic nervous system.

It is often associated with the fight-or-flight response, but that doesn't mean it only shows up when you’re in danger.

Your sympathetic nervous system helps your body respond to demands.

It can:

Increase heart rate and help deliver more blood to working muscles
Widen the airways to support increased oxygen delivery
Temporarily reduce digestive activity when other demands take priority
Make energy more readily available
Contribute to sweating and other responses involved in temperature regulation

And this system is operating throughout normal daily life.

Think about:

Working out
Standing up and adjusting to changes in blood pressure
Adjusting to changes in temperature
Focusing intensely
Responding to everyday demands
Dealing with minor stressors

You need sympathetic activation.

It isn’t something you need to eliminate.

Now let’s bring the parasympathetic nervous system into the picture.

A common analogy is to think of the sympathetic system as the gas pedal and the parasympathetic system as the brake.

It’s a useful analogy because it gives us a simple way to visualize activation and recovery.

But like most analogies, it isn't perfect.

Your nervous system isn’t simply switching between “gas” and “brake.”

These systems interact in much more complicated ways and are constantly adjusting your physiology based on what is happening around you and inside you.

Parasympathetic activity is involved in things such as:

Supporting reductions in heart rate when appropriate
Supporting digestion
Supporting rest and recovery
Helping with energy storage

You might notice this when:

You settle down after eating
You wind down for sleep
You recover after exercise
You rest after a demanding period

So the important point here is:

Neither system is the enemy.

You need activation.

You need recovery.

And your body needs to be able to adjust as the demands placed on it change.

That brings us to two terms that help explain what the body is actually trying to do.

Homeostasis and Allostasis

Two concepts that come up when we start looking at how the body maintains stability are homeostasis and allostasis.

They sound complicated, but the basic ideas are actually pretty straightforward.

Homeostasis

Homeostasis is the body’s ability to maintain relatively stable internal conditions.

Think about a thermostat.

If the temperature gets too high, the system responds to bring it back down.

If it gets too low, it responds in the other direction.

Your body does something similar with many important physiological variables, including things like temperature, blood pressure, blood chemistry and oxygen levels.

The goal is to keep things within ranges that allow the body to function properly.

Allostasis

Allostasis takes this idea a step further.

Rather than simply reacting when something changes, the body can adjust in anticipation of changing demands.

In simple terms:

Homeostasis = stability

Allostasis = stability through change

Think about exercise.

Your body doesn’t wait until your muscles are desperately demanding more oxygen before it responds.

As you begin exercising, your cardiovascular, respiratory and metabolic systems start adjusting to meet the new demand.

The same basic idea can be seen when you get up in the morning.

Your body is preparing for the transition from lying down to standing and moving around.

It is constantly making adjustments based on what is happening and what it expects may happen next.

And this brings us back to the bigger picture.

Your body isn’t trying to keep you in one state.

It is constantly adjusting to meet changing demands.

That is an important distinction when we start talking about regulation.

So What Does “Regulation” Actually Mean?

If we look around at the message being spread online, it can sometimes seem like:

Calm = Regulated

But what if we shifted the way we think about it?

Instead of thinking regulation means staying calm, maybe we should think about it as the ability to:

Respond appropriately + recover + adapt

That doesn’t mean you’ll never become anxious.

It doesn’t mean you’ll never feel stressed.

It doesn’t mean you’ll never get frustrated, angry or overwhelmed.

Those states are part of being human.

The question becomes:

How does your system respond to changing demands, and what happens afterward?

This is where the idea of autonomic flexibility becomes interesting.

Think about the suspension system of a vehicle driving down a bumpy road.

Good suspension doesn’t mean the road suddenly becomes smooth.

The bumps are still there.

Instead, the suspension helps the vehicle absorb those bumps without being thrown completely off course.

That’s a useful way to think about autonomic flexibility.

Your nervous system is constantly responding to changes in your environment and inside your body.

A stressful event may require more activation.

When the demand changes, your physiology can shift again toward recovery.

The goal isn’t to never experience activation.

The goal is to have a system that can respond to what is happening and adjust as circumstances change.

This is also where I think we need to be careful with the language we use.

You’ll often hear people talk about having a “high” or “low” nervous system flexibility, or describe someone as completely “dysregulated.”

Real human physiology is much more complicated than a simple label.

There isn’t one test that tells us whether someone is regulated or dysregulated.

There isn’t a single switch that gets flipped.

Instead, it can be more useful to think about how well your system responds, recovers and adapts across different situations.

And this is one of the reasons I’ve been digging deeper into this subject.

It is also part of the foundation behind REWIRED.

The goal isn’t to live in a permanently calm state.

The goal is to understand your responses and develop the ability to adapt.

Cortisol, Sleep and the Cortisol Awakening Response

Another area that gets talked about constantly when we discuss stress is cortisol.

Cortisol is often referred to as the “stress hormone.”

But that description can make it sound like cortisol is something we should avoid.

It isn’t.

Cortisol is an essential hormone involved in many functions throughout the body, including metabolism, immune activity and the body’s response to demands.

It also follows a daily rhythm.

For many people, cortisol rises around the time they wake up, with a noticeable increase during the first part of the morning.

This is known as the cortisol awakening response, or CAR.

And I think this is a great example of why we need to be careful about labeling every increase in physiological activity as “bad stress.”

Your body is supposed to change throughout the day.

You don’t want the exact same physiological state at 7 a.m. that you have at 11 p.m.

As the day progresses, cortisol generally follows a downward pattern, although the exact rhythm can vary between people and can be influenced by things like sleep, stress, illness, medications and other factors.

Again, the important point isn't that cortisol is good or bad.

Your body uses different physiological systems at different times and for different demands.

What Stress Actually Does

We all experience stress.

It isn’t something we can—or should—completely eliminate from our lives.

The important question is what happens in your body when stress shows up, and what happens afterward.

When your brain detects something that requires a response, your body can react before you’ve consciously had time to think through what is happening.

This is one reason you can suddenly notice:

Your heart beating faster
Your breathing changing
Your muscles tightening
Your attention narrowing
Your body becoming more alert

Sometimes this happens before you can even explain why.

One of the systems involved is the sympathetic nervous system.

It helps rapidly mobilize the body for action.

Heart rate can increase.

Breathing can change.

Blood flow can be redistributed.

Energy becomes more readily available.

At the same time, another system called the HPA axis can become involved.

HPA stands for:

Hypothalamus → Pituitary → Adrenal

This is a slower hormonal pathway that helps coordinate and sustain the body's response when a demand continues.

One of the major hormones involved is cortisol.

These aren’t separate systems operating in isolation.

Think of them as overlapping systems that operate on different timescales.

The autonomic nervous system can respond rapidly.

The HPA axis operates more slowly and helps coordinate a longer-lasting response.

Together, these changes temporarily shift your body’s priorities toward dealing with the immediate demand rather than things that can wait, such as digestion and some longer-term maintenance processes.

Think about being startled by a car horn while crossing the street.

You don’t need to consciously decide:

“I should increase my heart rate now.”

Your body is already responding.

And the interesting thing is that your body doesn’t only respond this way to physical danger.

Modern stressors can involve:

Deadlines
Difficult conversations
Financial pressure
Relationship problems
Public speaking
Work demands
Worrying about something that hasn’t happened yet

Your body doesn’t necessarily distinguish between:

“I’m standing in front of a bear.”

and

“I have a difficult presentation in 20 minutes.”

in the simple way we might.

The exact physiological response depends on the situation, the person and how the brain interprets the demand.

But psychological stress can absolutely produce real physical changes.

This is why stress isn’t simply “in your head.”

Your thoughts, perceptions and emotions can influence real physiological processes in your body.

And that is an important distinction.

The physical response you're experiencing isn't necessarily evidence that something has gone wrong.

Sometimes, your body is doing exactly what it was designed to do.

Where Social Media Gets the Nervous System Wrong

This is where things get interesting.

The nervous system has become a huge topic online.

And in many ways, that’s a good thing.

More people are learning that stress isn’t simply something they should “think their way out of.”

But as these ideas have become more popular, some of the science has been simplified into formulas that sound good but don’t tell the whole story.

Let’s take a look at a few.

Sympathetic = Bad

Sympathetic activation isn’t something you need to eliminate.

You use it when you exercise, respond to a challenge, focus intensely and adapt to changing demands.

The question isn’t:

“How do I stop sympathetic activation?”

A better question might be:

“Can my body respond when it needs to and shift when the demand changes?”

Parasympathetic = Good

The parasympathetic system is involved in rest, digestion and recovery.

But more isn’t automatically better.

You don’t want maximum parasympathetic activity while sprinting across the road to avoid a car.

You want your nervous system to respond appropriately to what is happening.

“You’re Stuck in Fight or Flight”

This is another phrase we hear a lot.

But the nervous system isn’t a simple machine that gets permanently stuck in one setting.

People can absolutely experience prolonged stress, heightened arousal and difficulty returning to a more settled state.

But saying someone is literally “stuck in fight or flight” can make a complicated physiological process sound much more straightforward than it is.

The more useful question is:

What is your system responding to, and what happens when the demand is gone?

Cortisol Is Bad

This is probably one of the biggest ones.

The social-media version can sound like:

“You’re stressed because your cortisol is too high.”

But cortisol isn’t a harmful substance your body needs to get rid of.

It is an essential hormone.

The better question isn’t simply:

“How do I lower my cortisol?”

It’s:

“Is my stress system responding appropriately to the demands I’m experiencing, and what happens when those demands change?”

You Need to Stimulate Your Vagus Nerve

The vagus nerve has become something of a celebrity online.

And for good reason.

It plays an important role in communication between the brain and organs throughout the body and is involved in parasympathetic regulation.

The vagus nerve matters.

But it isn’t a magic reset button.

There isn’t one breathing technique, cold plunge, sound, exercise or “vagus nerve hack” that suddenly fixes your entire nervous system.

Your nervous system is much more complicated than that.

So What Can Actually Help?

This is probably the question most people actually want answered.

If there isn’t one magic nervous system reset, then what can we do?

The answer is both less exciting and more useful:

A lot of things can help.

Not one thing.

Not one hack.

Not one breathing exercise.

Not one supplement.

Not one cold shower.

A number of things can support how we respond, recover and adapt.

These can include:

Breathing practices
Physical activity
Sleep
Social connection
Reducing ongoing stressors where possible
Psychological interventions
Mindfulness and attention practices
Relaxation

The important thing is that these aren’t competing answers.

They can all play different roles.

And what works for one person in one situation may not be what they need in another.

Sometimes you need activation.

Sometimes you need recovery.

Sometimes you need to change the environment creating the stress.

Sometimes you need to change the way you are responding to it.

And sometimes you need to learn that the reaction your body is having isn’t something you need to fear.

That, to me, is a much more useful way of looking at the nervous system.

The Goal Isn’t to Stay Calm

The more I’ve learned about the nervous system, the more I’ve moved away from the idea that the goal is to always feel calm.

Because life isn’t calm.

You’re going to have difficult conversations.

You’re going to have deadlines.

You’re going to get frustrated.

You’re going to be excited.

You’re going to get nervous before something important.

You’re going to experience loss, uncertainty, pressure and change.

You’re also going to have moments of connection, laughter, excitement and challenge.

All of those experiences require your body to respond.

So maybe the goal shouldn’t be:

“How do I keep my nervous system calm?”

Maybe the better question is:

“How capable is my system of responding to what life is asking of me?”

Can I activate when I need to?

Can I settle when the demand has passed?

Can I recover?

Can I adapt?

Can I recognize what my body is doing without immediately assuming something is wrong?

And perhaps most importantly:

Can I build a better relationship with my own responses instead of constantly fighting against them?

That is a very different way of looking at regulation.

And it is the thinking behind why I created REWIRED.

REWIRED isn’t about teaching you how to live in a permanently relaxed state.

It isn’t about eliminating stress.

And it certainly isn’t about finding one magic trick that resets your nervous system.

It is about understanding what is happening beneath the surface.

Understanding your patterns.

Understanding how your body responds to stress and demand.

Learning how to recognize when you are activated, when you need recovery, and what may be keeping those patterns going.

Because your nervous system isn’t broken simply because you feel anxious.

It isn’t broken because your heart races before a presentation.

It isn’t broken because you sometimes feel overwhelmed.

And it isn’t broken because you have a stress response.

Those responses exist for a reason.

The question is whether those responses still fit the demands you're facing—and whether your system has the opportunity to adapt when those demands change.

That’s where the conversation gets much more interesting.

Instead of trying to control every feeling, we can start learning to understand our responses.

Instead of trying to stay calm all the time, we can develop our ability to respond, recover and adapt.

And instead of seeing the nervous system as something we need to constantly “fix,” we can start seeing it for what it actually is:

A complex system that is constantly trying to help us meet the demands of being alive.

Maybe the goal isn’t to become calm.

Maybe the goal is to become more capable.

More aware.

More adaptable.

And better able to meet whatever comes next.

That is what being REWIRED is really about.