Linnea Passaler: Co-Parenting and Your Nervous System

The Short Answer

Linnea Passaler, founder of Heal Your Nervous System, teaches that chronic stress lives in the body's autonomic nervous system, not just the mind. For divorced co-parents, the body reacts to a text from an ex the same way it once reacted to threats in the marriage. Custody handoffs, schedule changes, and even neutral messages can trigger fight, flight, freeze, or fawn responses. The work is not just to think differently. It is to regulate the nervous system itself.

Key Takeaways

• Linnea Passaler is the founder of Heal Your Nervous System, with over 800,000 followers, and the author of a book on nervous system regulation.
• Chronic stress and trauma live in the autonomic nervous system, not just the mind.
• Co-parenting keeps the nervous system in a heightened state long after the divorce is finalized.
• The four trauma responses are fight, flight, freeze, and fawn. All four can show up in co-parenting interactions.
• Body based regulation tools, like breathwork, grounding, and somatic awareness, change co-parenting faster than insight alone.

Reviewed and written by Cindy Weathers, LMFT, a Licensed Marriage and Family Therapist and co-founder of Two Paths. Cindy specializes in high conflict divorce, co-parenting after betrayal, and helping separated parents build functional partnerships for the sake of their children.

Linnea Passaler runs one of the most followed Instagram accounts in the nervous system regulation space, @healyournervoussystem, and her work has reached over a million people seeking relief from chronic stress and trauma responses.

She is not specifically a co-parenting expert. But her framework, which focuses on how chronic stress reshapes the autonomic nervous system, is one of the most useful lenses I have found for understanding why co-parenting after a difficult divorce feels so physically exhausting.

Most divorced parents I work with do not need to be told to think differently about their ex. They have done that work in therapy. What they have not done is the body work. And the body is where the co-parenting struggle actually lives.

Let me walk you through what Linnea's framing actually means for you.

Why Co-Parenting Lives in the Body

When you were in a relationship that ended badly, your body learned to associate your ex with threat. Not necessarily physical threat. Emotional threat. Conflict. Unpredictability. Hurt.

That association does not unwire when the divorce papers are signed. Your nervous system is still tuned to the same wavelength.

So when your ex's name pops up on your phone, your heart rate climbs before you have even read the message. Your jaw tightens. Your breath shortens. You feel a wave of dread that is wildly disproportionate to whatever they actually said.

This is not weakness. This is a nervous system doing its job, based on the data it has. The data is years of conflict. The job is to protect you.

The problem is that you still have to co-parent with this person, often for another decade or two. And every interaction reinforces the same threat response, unless you do something to interrupt it.

The Four Trauma Responses in Co-Parenting

Linnea draws from polyvagal theory and trauma research to identify four main nervous system responses to threat. All four show up in co-parenting.

Fight. You read your ex's message and feel rage. Your body wants to defend, attack, escalate. You write a long, angry reply. You think about everything they did wrong in the marriage. You feel justified and you feel huge.

Flight. You read the message and feel panic. You want to leave the situation. You scroll your phone, check your email, do anything to get away from the feeling. You make impulsive decisions about the schedule just to end the discomfort.

Freeze. You read the message and go numb. Time slows down. You stare at the phone unable to form a response. Hours pass. You feel paralyzed and slightly dissociated.

Fawn. You read the message and immediately try to smooth things over. You apologize even when you did nothing wrong. You over-accommodate. You agree to schedule changes you do not actually want, because the conflict feels intolerable.

Most people have a primary response and a secondary one. Recognizing which is yours is the first piece of nervous system work.

Why Insight Is Not Enough

Here is the core of why I keep recommending Linnea's work to my divorced clients.

If you have done years of therapy, you probably already understand intellectually why your ex triggers you. You can name the patterns. You can analyze the dynamic. You can articulate exactly what is happening in your relationship.

And you still react with the same flood of cortisol every time their name lights up your phone.

Insight does not regulate the nervous system. Body practices do. This is what Linnea teaches consistently, and it is what most divorce recovery work misses.

You cannot think your way to a regulated nervous system. You have to practice your way there.

What Body Based Regulation Actually Looks Like

The good news is that nervous system regulation tools are simple, free, and quick. The bad news is that they take consistent practice, not occasional attention.

Here are the tools I find most useful for co-parents in my practice.

Box breathing before you check your phone. Four counts in, four counts hold, four counts out, four counts hold. Three rounds. Do this every single time before you open a message from your ex. Two minutes. It changes your physiological state before you read the content.

Grounding through your senses. Five things you can see. Four things you can touch. Three things you can hear. Two things you can smell. One thing you can taste. This pulls your nervous system out of fight or flight and into the present moment.

Cold water on your face. Especially under the eyes. This triggers the mammalian dive reflex, which directly activates the parasympathetic nervous system. Useful when you are seconds away from sending a text you will regret.

Long exhales. Exhales longer than your inhales activate the vagus nerve, which calms the body. Four counts in, eight counts out. Three rounds.

Movement. Walking, especially outside, after a difficult interaction with your ex. Twenty minutes minimum. This metabolizes the cortisol your body produced during the interaction.

These tools sound small. They are not. Done consistently, over weeks and months, they reshape how your body responds to your ex.

Custody Handoffs and the Nervous System

The most common nervous system flashpoint for divorced parents is the custody handoff.

You see your ex's car. Your heart rate climbs. Your shoulders tense. You feel the entire weight of the marriage in your body, even though you are just exchanging children.

The handoff is also when most public conflicts happen. Because both nervous systems are activated. Both bodies are flooded. And then one person says something neutral that the other person hears as hostile, and a fight begins in front of the kids.

Linnea's framing on this is direct. You cannot fix the handoff by negotiating better with your ex. You can only fix it by regulating before you arrive.

The protocol I share with clients. Twenty minutes of regulation work before handoff. Walk. Box breathe. Music that grounds you. Whatever you need. Arrive in a regulated state.

If you can regulate even 30% better, the handoff goes 80% better. Because most of what makes handoffs explosive is two dysregulated nervous systems triggering each other.

When Your Kids' Nervous Systems Are Involved

This is the piece that often motivates parents most. Your nervous system regulation is contagious.

Kids of divorce live in two different nervous system environments. When you are dysregulated at handoff, your kid absorbs that. When you are dysregulated for hours after a fight with your ex, your kid absorbs that. When you spend years in a chronically activated state, your kid grows up with a nervous system shaped by yours.

This is why nervous system regulation is not just self care for the divorced parent. It is a parenting intervention.

Every regulated handoff is a small healing. Every regulated text exchange is a small healing. Over years, this adds up.

If you are not sure where to start with this work, our LMFT co-parenting support connects you with a therapist who can help you build a regulation practice tailored to your specific triggers and patterns.

The Bottom Line

Linnea Passaler's work makes one thing clear. The reason co-parenting feels so impossible to most divorced parents is not that they have not figured it out intellectually. It is that their nervous system has not caught up to the divorce.

The marriage might be over. The shared household might be over. The romantic relationship might be over. But your body still reacts to your ex as if all of those threats are still active.

You cannot reason your way out of that. You have to regulate your way out of it.

Twenty minutes of nervous system work a day, especially before any interaction with your ex, will do more for your co-parenting than any communication strategy you can read about.

If your ex is high conflict on top of all this, the body work is even more important. Our BIFF response guide covers what to write. But what you write only matters if you can regulate enough to actually send the calm version.

Frequently Asked Questions

Who is Linnea Passaler?

Linnea Passaler is the founder of Heal Your Nervous System, an online platform that teaches nervous system regulation tools to a global audience of over a million people. She has a background in medicine and turned to nervous system work after her own healing journey. Her book on nervous system regulation has reached a wide audience seeking relief from chronic stress and trauma symptoms.

What does it mean to have a dysregulated nervous system?

A dysregulated nervous system is one that is stuck in chronic activation, either in a sympathetic state (fight or flight) or in a dorsal vagal state (freeze or shutdown). It cannot easily return to a regulated, parasympathetic state. People with dysregulated nervous systems often experience chronic anxiety, exhaustion, hypervigilance, or emotional numbness. Divorce and high conflict co-parenting are common contributors to nervous system dysregulation.

How long does it take to regulate the nervous system after divorce?

There is no single timeline. Most people in my practice see meaningful shifts within three to six months of consistent nervous system work, but full regulation takes longer, especially if there was significant trauma in the marriage. The work is cumulative. Small daily practices compound over time. Inconsistent practice produces inconsistent results.

Can nervous system work replace therapy?

No. Nervous system regulation tools are one piece of healing. Therapy, especially trauma focused therapy, EMDR, somatic experiencing, or Internal Family Systems, addresses the deeper material that the regulation tools help you cope with. The combination of insight work plus body work produces the most lasting change. Body work alone can stabilize you. It does not heal the underlying patterns.

What is polyvagal theory?

Polyvagal theory, developed by Dr. Stephen Porges, describes how the vagus nerve organizes our nervous system responses to safety and threat. The theory identifies three main states. Ventral vagal (safe, social, regulated), sympathetic (fight or flight), and dorsal vagal (freeze, shutdown). Much of Linnea Passaler's work and modern nervous system regulation tools draw from this framework.

Why do custody handoffs trigger such strong reactions?

Custody handoffs combine multiple nervous system triggers. Direct contact with the person who hurt you. The presence of your children, who you want to protect. Time pressure. Often a public location. And the body's learned association between your ex and threat. This combination puts most divorced parents into sympathetic activation, often without conscious awareness, which is why handoffs often escalate into fights.

What is the fawn response in co-parenting?

The fawn response is one of four trauma responses, alongside fight, flight, and freeze. It involves over-accommodating to avoid conflict. In co-parenting, this often looks like agreeing to schedule changes you do not actually want, apologizing for things that were not your fault, or working harder to please your ex than the situation requires. Fawning is a self protective strategy from childhood, often developed in homes where conflict was unsafe. It is exhausting and unsustainable as a long term co-parenting strategy.