What Are Nervous System States? A Complete Guide to Why Some Days Feel So Much Harder Than Others
Ever had one of those days where absolutely everything seems to go wrong? Someone doesn’t say good morning. You spill coffee on your favorite shirt. You miss the light at every intersection. By the time you get home, you’ve decided the universe is out to get you.
Here’s what I want to offer instead: it’s probably not the day. It’s your nervous system states, quietly deciding what you’re even capable of noticing.
In this post, I’ll walk you through what nervous system states actually are, how they shape everything from your senses to your memory to your relationships to your sense of purpose, and why learning your own states might be one of the more useful things you ever do for yourself.
In this post, you’ll learn:
- What nervous system states are and the mechanism behind them
- How your state literally changes what your senses pick up
- Why your state affects your actual focus, memory, and behavior ~ not just your perception
- Why relationships can feel harder depending on your state, and what’s really going on
- Why the exact same situation can feel completely different depending on your state
- A handful of the real, practical shifts that happen once you know your own states
What Are Nervous System States? Breaking Down The Basics
There’s a quote that’s been passed around and attributed to all kinds of teachers over the years, though as far as I can trace it, it was originally written by Anaïs Nin:
“We don’t see things as they are, we see them as we are.”
It turns out that’s not just a nice sentiment. It’s a mechanism.
In every second, close to two billion sensory impressions land on you ~ every shade of color, every sound, every smell, every sensation on your skin. If all of that reached your conscious awareness at once, you’d be completely overwhelmed. So there’s a structure in your brain, called the reticular activating system (RAS), whose entire job is to filter those two billion impressions down to whatever’s relevant enough to reach your conscious mind.
Here’s the part that changes everything: that filter isn’t neutral. It doesn’t decide what to let through based on what’s objectively important. It decides based on what you already believe.
Of the two billion sensory impressions landing on you every second, only a tiny fraction actually reaches conscious awareness ~ a number so small it’s effectively zero percent.
Underneath those beliefs, though, is something even more foundational setting the filter: your nervous system state.
Your autonomic nervous system runs constantly in the background, underneath conscious thought, and its whole job is to keep you alive. It moves through a few main states:
- Ventral vagal ~ safe, connected, at ease
- Sympathetic ~ activated, mobilized, ready to fight or run
- Dorsal vagal ~ shut down, flat, low on energy
These three states are the actual lens your two billion sensory impressions get filtered through.
How Nervous System States Actually Work
Here’s an image I love for this: think of each state as a key. Each one unlocks a specific room of your own mind and behavior.
- Ventral vagal is the key to the room of social engagement ~ connection, learning, exchange, feeling safe with another person.
- Sympathetic is the key to the mobilization room ~ fight, flight, or on a mental level, resistance and checking out.
- Dorsal vagal is the key to the immobilization room ~ rest and digestion, or full shutdown, depending on what else is present.
You only have access to what’s actually in the room the active key has opened. Whatever’s in the other rooms simply isn’t reachable from where you’re standing, no matter how much you might want it to be.
And this isn’t only shaping your mood ~ it’s shaping your actual senses. There are tiny muscles in your middle ear that tune what kind of sound you’re able to hear. In a safe, ventral state, those muscles tune toward human voices. The moment you shift into sympathetic activation, that tuning changes: your ability to pick out human voices decreases, while your ears tune toward anything that could signal danger. It’s part of why, when you’re stressed, you can feel like you’re being talked at and still miss half of what someone said. Your ears were listening for something else.
In my own experience, this shows up with smell too ~ when I’m activated, on edge, smells that wouldn’t normally bother me suddenly feel unbearable.
This isn’t only something modern neuroscience has caught up to, either. Contemplative traditions have pointed to versions of this for a long time. In the Kundalini tradition I trained in, there’s a teaching on three brains ~ head, heart, and gut ~ each an actual neurological center with its own way of perceiving. Left on its own, the head-brain tends to see life in fairly flat, two-dimensional terms: this or that, right or wrong. When your system contracts, awareness tends to collapse up into the head-brain alone, cut off from the heart and gut ~ giving you that same narrow, binary read on your life that the neuroscience describes from a completely different angle.
It’s Not Just What You Notice
Here’s where this goes one step further, because it isn’t only about perception.
When you’re in sympathetic activation or dorsal shutdown, you don’t just notice fewer good things. You actually have less access to your own cognitive functions ~ less access to focus, to memory, to being genuinely present with whatever’s in front of you. This is well documented: activity in the prefrontal cortex, the part of your brain responsible for planning and clear thinking, measurably drops when your system moves into a stress response. Your body awareness drops too. You lose some access to yourself.
Which means it’s not only that you notice the bad things more on those days. It’s that more things genuinely might go “wrong.” You’re scattered. You’re half a step behind your own life. So you actually do forget the thing you needed to bring. You actually are late, because you weren’t fully tracking the time. You actually do drop your favorite mug, because you weren’t quite present enough to feel it slipping in your hand. It’s not confirmation bias dressed up as a bad day. Some of it is real, and it’s coming from a nervous system that’s using its resources to survive instead of to help you function smoothly.
And this is part of why relationships can feel so much harder on those days too. Ventral vagal is literally called your social engagement system ~ it’s the state that governs warmth in your face, warmth in your voice, your whole capacity for real exchange with another person. When you shift out of it, that key isn’t in the lock anymore. You’re not choosing to be more distant with the people you love; the actual system responsible for producing warmth is simply offline for a while.
And it runs both directions ~ your nervous system and theirs are constantly reading each other, picking up on each other’s state, even as adults. So it’s not only that you experience your partner differently when you’re dysregulated. They can start to feel pulled into activation or shutdown too, just from being near your state. Two nervous systems doing that to each other can escalate a small moment into something much bigger, surprisingly fast.
Now, in a lot of spiritual circles, there’s a version of this idea already ~ the energy you put out is what you get back. I don’t think that’s wrong, exactly. But I think it’s often told in a way that quietly blames you, as if your state was a careless choice, and the missed train or the hard conversation was somehow deserved.
That’s not what I want to offer here. Your nervous system didn’t drop into sympathetic or dorsal because you did something wrong. It read your circumstances as too much and made a decision to protect you, rather than to help you plan your day perfectly. That’s not a failure of your energy. That’s your body trying to keep you safe.
So yes ~ take care of yourself, nourish your system, take real responsibility for tending to your own state over time. That matters, and it’s a big part of why the resource below exists. But taking responsibility for your state going forward is a different thing entirely from blaming yourself for the state you were already in. One builds capacity. The other just adds a harder day on top of a hard day.
Illustrative Example: The Same Cat, Three Different Realities
Let me show you what I mean with something very ordinary: our cat, Onik.
Onik has her own personality, like all of us. There are places in the house she’s not allowed ~ the kitchen is the big one, since she knocks things over. At night, she and our other cat sleep inside, partly because of the wildlife around here and partly because nobody wants a cat fight at 2am. But every now and then, when it gets dark, Onik makes a break for it and hides out on top of the garage.
When I’m feeling balanced and relaxed ~ ventral ~ I can actually laugh about it when she’s snuck back into the kitchen and gives herself away with a loud meow. I pick her up, smother her in kisses, and tell her what a cheeky little troublemaker she is.
When I’m stressed ~ sympathetic ~ real irritation can come up fast. I shoo her away and have zero interest in connecting with her.
And when I’m really low ~ flat, no energy, dorsal ~ the thoughts that show up are more like: how is this even going to work with her? Why did we even get cats? This was a huge mistake.
Same cat. Same kitchen dash. Same hiding spot. Nothing about Onik changed in any of those moments. I changed. And because I changed, she became a completely different creature to me ~ a delight, an annoyance, a mistake.
Nervous System States In The Real World
It’s not just the cat, either. This is the exact same pattern I unpacked in a previous episode of the podcast, on purpose and meaning ~ [you can listen to that full episode here].
During a stretch of hard weeks ~ a hip injury keeping me from moving, days of grey sky after grey sky, big life logistics we hadn’t asked for ~ I found myself questioning everything. My work, my choices, my worth. It came dressed up as something enormous: am I even on the right path? Is any of this worth it?
What I’ve come to see is this: it was never really about my work or my choices. It was that my system was coloring everything in black. My sense of purpose hadn’t gone anywhere. My ability to perceive it had simply contracted for a while.
That’s the wider truth underneath the specific example: it’s not only your sense of purpose that narrows when your system contracts. It’s your sense of everything ~ the people around you, the situation you’re in, yourself, what feels possible. All of it moves through the same filter, set by the same state.
One honest caveat before we go further: ventral, sympathetic, and dorsal are teaching models, not boxes you live in. In real life, you’re rarely purely in one state ~ it’s more like mixing colors. Rather than “I am either blue or yellow,” it’s often more accurate to notice “there’s a bit of blue and a bit of yellow happening here.” Two states can absolutely be true in your body at once.
Why Knowing Your Nervous System States Actually Matters
Once you start recognizing your own states, a handful of real, practical shifts become available to you.
You stop mistaking a state for a fact about your life. You look at your to-do list and everything on it feels impossible ~ and the thought that shows up is “I’m just not cut out for this.” But that thought didn’t come from the to-do list. It came from dorsal, from a system that’s flat and low on resources telling you everything is too much right now. Once you know that, “I’m just not cut out for this” becomes “I’m in a contracted state right now” ~ and those two sentences send you toward completely different next steps.
You start knowing which move actually helps, instead of guessing. Sitting down to meditate when your body is buzzing with sympathetic energy rarely works ~ you end up more agitated, fighting your own racing thoughts, because what that state actually needs is movement: a walk, shaking your hands out, something that lets the activation move through and out. On other days, what you need is rest. Sometimes what you need most is connection with another person. Those are three different medicines for three different states, and reaching for the wrong one is often why the “healthy habit” didn’t work.
You stop unconsciously manufacturing drama just to feel something familiar. Think of your nervous system like a thermostat. If yours is set to a healthy baseline, it drifts a little up, a little down, and always settles back to calm. But if yours has been running hot for a long time ~ set closer to a constant simmer of stress ~ calm doesn’t feel like relief. It feels like something’s missing. Your system has gotten used to a certain level of stress hormones, and when they’re not there, it can go looking for a reason to bring them back.
This is how someone ends up picking a fight with a partner who’s actually being perfectly kind, or suddenly deciding their steady, good life is “boring.” It was never really about the partner, or the life. It was the system reaching for its familiar temperature.
You build an actual felt map of yourself, instead of relying on willpower alone. Willpower says: I feel heavy and flat today, but I should push through anyway, so I’ll force myself to sit down and grind through my to-do list. A felt map says something different: I notice I’m heavy and flat ~ that’s dorsal, that’s my body asking for a different kind of input. So instead of forcing my way to the desk, I acknowledge the exhaustion, take some rest, take a short walk to get some movement and energy into my system, and then sit down to work. Same task, same day ~ but one approach fights your own nervous system, and the other works with it.
There are three more shifts that happen once you know your own states ~ including what it does for your intuition, your memory, and your ability to tell a real alarm from a false one. I get into all seven in the full podcast episode, [Having One of Those Days? Here’s What Your Nervous System Is Actually Doing].
How To Get Started
You don’t need to overhaul anything to begin. Start simply: a few times a day, pause and ask which room you’re actually standing in right now. Ventral, sympathetic, or dorsal ~ or, more likely, some blend of two. Notice it without judgment. That’s it. That single habit, repeated, is what starts building the felt map.
If you want a more structured way in, I created a personal profile map to help with exactly this. It walks you through the three states, with space for you to write in your own experience of each one ~ what the world looks like to you there, what people are like to you there, who you are there. There’s also a section on your own window of tolerance, and a worksheet for catching the early red flags that tell you your state is starting to shift, before you’re all the way in it.
It’s not about achieving some perfectly regulated version of yourself ~ it’s about knowing your own map well enough that you can meet yourself with a little more compassion, wherever you actually are.
Common Questions About About Nervous System States
What are nervous system states?
Nervous system states are the three main modes your autonomic nervous system moves through: ventral vagal (safe and connected), sympathetic (activated and mobilized), and dorsal vagal (shut down and low-energy). Each state shapes what you perceive, how you interpret situations, and which behaviors are available to you in that moment.
How many nervous system states are there?
Polyvagal theory describes three primary states ~ ventral vagal, sympathetic, and dorsal vagal ~ though in practice people rarely sit in just one. Most everyday experience is a blend of two or even three states at once, similar to mixing colors.
Can your nervous system state change how you perceive reality?
Yes. Your nervous system state affects which sensory information reaches conscious awareness, including sound (your middle ear tunes differently depending on state) and, anecdotally, smell. It also shapes memory, intuition, and whether you read a neutral situation as safe or threatening.
What’s the difference between sympathetic and dorsal states?
Sympathetic is an activated, mobilized state ~ your body preparing to fight or flee, either physically or mentally. Dorsal is a shutdown state ~ low energy, flat, disconnected. Both are protective responses, but they call for different things: sympathetic activation often needs movement to discharge, while dorsal shutdown often needs rest before anything else and then some movement.
Why do relationships feel harder when I’m stressed or shut down?
Ventral vagal, your safe and connected state, is also known as the social engagement system ~ it governs facial warmth, vocal tone, and your capacity for real connection. When you shift into sympathetic or dorsal, that system goes offline, so warmth and presence become harder to offer, not because you’re choosing distance but because the physiological system for producing it isn’t active. Nervous systems also read each other’s state (co-regulation), so a dysregulated state can pull the people close to you toward activation or shutdown too.
How do I know which nervous system state I’m in?
Start by noticing your body rather than your thoughts: energy level, muscle tension, whether you feel drawn toward or away from people. Over time, tracking your own patterns ~ what a state feels like, what the world looks like from inside it ~ builds an accurate personal map, which is exactly what a structured tool like a nervous system profile map is designed to help with.
Final Thoughts
We don’t see things as they are, we see them as we are. Now you know a little more about what “as we are” actually means: your filter, your senses, your nervous system, all working together in every moment to decide which version of reality reaches you.
What feels true for you today is the truth you get to notice today. And tomorrow, in a different state, an entirely different truth might be just as available to you.
I’d love to hear what came up for you while reading this ~ drop a comment below, or listen to the full episode for the rest of the story.
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I’m Lisa, NeuroEmbodiment® Coach, Somatic Kundalini Facilitator, and Pranic Healer. The Frequency You Hold is the space where the wisdom of the nervous system and the ancient depth of Kundalini energy meet ~ somatic safety, energy work, and embodiment practices to support you in coming home to the deep self-trust that already lives within you.
This podcast is for you if you haven’t followed the traditional path society expected ~ maybe you chose a different family model, left your home country, started over in a new career, or simply hold different world views than the people around you. If that’s you ~ you don’t have to walk this path alone. Let’s expand our capacity for life ~ together.
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