I was reflecting recently on something I’ve felt myself and seen in many clients: that even when you know your relationship is over, your body might still ache with a different kind of grief — the loss of the other body. The loss of the nervous system pattern you've known.

You see when we end a long term relationship, whether it be an intimate or close platonic relationship, it is not only the financial and logistical separation and negotiation that happens. Our bodies keep the score and there is a physical separation of nervous systems that have entrained to each other.

Our nervous systems attune to the bodies we live with. Even if the relationship was painful or over long ago, your body might still long for their touch, their presence, even their smell.

This isn’t about wanting the person back — it’s about missing the co-regulation, the shared rhythm your nervous systems built together. It’s why sleeping alone can feel painful. Why your skin aches. Why you cry and you don’t know why.

Entrainment is when two nervous systems get in sync with each other, a bit like two clocks ticking together or two metronomes lining up. When you live with someone, your breath, heart rate, stress patterns, and even sleep rhythms start to line up with theirs. Your bodies learn each other. That’s why, when they’re gone, your body still remembers that pattern — and it can feel strange or even painful until you find a new rhythm.

The entrainment of nervous systems, especially in close relationships, is such a subtle and powerful force. It’s part of why even dysregulated relationships can be hard to leave — because the body gets patterned into that rhythm, even if it’s chaotic or unpredictable. I some times think of this phenomena as co-dysregulation.

In healthy relationships, this entrainment creates a deep sense of safety and grounding. But in any relationship with proximity over time, the nervous systems begin to sync — breath to breath, step to step, sleep cycles, even hormone levels. It's primal. It's ancient. And when it’s gone, the body doesn’t just let go because the mind says it should.

When this stops, the body reacts with disorientation, grief and longing.

This isn’t about missing the person romantically or doubting the decision. It’s about the withdrawal of co-regulation — a physical and energetic loss. Where there was once a warm body, there is now space. The nervous system goes through a recalibration, and sometimes, a kind of withdrawal.

We can experience shame and confusion around this.

Many people feel embarrassed or confused by their grief, especially if they initiated the separation or felt clear. They may wonder: “Why am I crying? Why does my chest ache? Why do I feel so alone? It is important to normalise that this is nervous system memory, not a sign that they’ve made the wrong choice.

What are some practices that can support you?

Orient to touch — a hand on the heart, a warm wrap, a pillow beside your body in bed.
Use scent, rhythm, and sound to create new patterns of regulation.
Let the body feel the grief — let the tears, the ache, the longing move. The body needs to move downward to express grief so sometimes, lying on a soft nest of pillows can be a really supportive way to do this.
Use nature, animals, breath, or trusted others to co-regulate in new ways.

Remember, relationships ending can be both a liberation and a loss. Our bodies are sometimes slower than our minds when it comes to moving on and they ask us to honour what was, whilst we are moving into what is next for us.

The invitation here is to trust the wisdom of your body and honour this unique grief without judgment.

My husband and I go for a walk most days. It’s our rhythm — a way to move our bodies and catch up on the day. Yesterday, something unexpected caught our eye. Tucked along the top of a fence were a handful of tiny plastic ducks, placed as if they'd just wandered into the world on their own. There was no sign, no explanation. Just… ducks.

We both smiled, paused, and shared that kind of gentle, wide-eyed delight you get when something small pierces through the ordinary — wonder, joy, amusement. We giggled and wondered who might have placed them there. There are several schools in the area and we thought maybe one of the high school students. We wondered, is it art? Is it a puzzle? Or, did someone do it just for their own delight? And as we walked on, I noticed: I felt better. Not just because of the ducks, but because of how we felt together.

You see, you could have easily missed these tiny ducks they were as big as an Australian 5 cent coin. If you were caught in your head thinking about some problem, or looking elsewhere, looking at your phone, you would never have seen them. I will admit my husband saw them first, I was looking at some trees wondering when winter will end and when might the leaves start to arrive. As we started looking together, we saw 8 little ducks along two streets over an 800 metre stretch.

That moment we experienced together was co-regulation.

Co-regulation is more than a feel-good moment — it’s a biological necessity. Our nervous systems are constantly scanning the environment and people around us for cues of safety or threat (neuroception). When we feel safe with someone, our ventral vagal system activates — this is the branch of the parasympathetic nervous system responsible for connection, calm, and social engagement.

Co-regulation is the process by which our nervous systems connect and attune to one another, helping each other return to a state of balance, calm, or connection; especially after stress or activation. It’s something we are wired for, from birth. In infancy, we rely on caregivers to regulate our nervous system through touch, voice, gaze, and presence. As adults, we continue to rely on co-regulation in our relationships, though we often forget just how powerful it is.

At its heart, co-regulation is:

Relational regulation: one person’s regulated state helping another feel safe, grounded, or more connected.
Non-verbal: eye contact, tone, facial expression, body language, even silence can co-regulate.
Mutual: it’s not about fixing, it’s about being with.
Built on safety: when we feel safe with someone, our nervous system can soften and settle.

Co-regulation matters to the nervous system because it is foundational to nervous system health supporting vagal tone, heart rate variability and overall resilience. It supports our emotional well-being because when we share these tiny moments of joy, we feel less alone and more supported, seen and understood. It fosters trust and attunement, between partners, within families, friendships and teams, Co-regulation is supportive of trauma healing. Remember Trauma occurs when we experience too much, too fast, too soon or too little for too long. Healing happens in safe relationships when we can go slowly together. It is fair to say that without co-regulation our nervous system could end up in a constant state of vigilance or shutdown. With co-regulation we slow down, we are more present and we expand our capacity to feel joy, grief, pleasure and connection.

How do we find these moments for co-regulation?

Well every day offers us opportunities of ‘moments of tiny joys’.

We often think co-regulation has to be deep, profound or emotional. It can be, and, it can also be simple and playful too. What matters is the shared presence and the ability to attune to each others experience.

When I was going through cancer treatment five years ago, I decided I wanted to practice orienting to pleasure and what feels good to support my nervous system. You see I knew that small moments of pleasure are very healing for the nervous system. So I used to go for a small walk twice a day. This was during the pandemic, so often I would see my neighbours and we would stop and chat from a small distance; remember we had to social distance, and my immune system was smashed from chemotherapy, so I really had to mind how close I got to people. But what I really attuned to was admiring people’s gardens and the plants and flowers. You see I love gardens. My husband and I really looked forward to these small walks because they helped both of us in our own way and we could appreciate the moments of tiny joy in what was a really tough time for us.

““Being awestruck dwarfs us, humbles us, makes us aware we are part of a universe unfathomably larger than ourselves… Wonder makes us stop and ask questions about the world… whether spectacular or mundane.””

— Phospherescence - Julia Baird

What are some practice ideas for you to find little moments of co-regulation with another person?

Walking rituals: Regular, low-stress time in movement and nature together.

Noticing beauty: Make it a shared game to find one “small wonder” each day — something delightful, surprising, or tender.

Name the moment: Saying aloud, “That’s so sweet!” or “That made me smile” helps anchor the moment and co-regulate more deeply.

Touch points: Eye contact, a hand squeeze, a shared laugh — they reinforce safety in subtle, nervous-system-friendly ways.

You can build a micro-ritual around this — one that supports connection even during stress or busyness.

So here is your invitation to think about what brings you shared delight, awe and wonder?

What are the small and unexpected things that bring you joy?

When was the last time you felt a quiet togetherness in a moment of delight?

Is there someone you could begin a small ritual of ‘tiny moments of joy’ with?

Remember, co-regulation doesn’t require words, big feelings or problem solving. It begins with another.

Do you ever wonder why breakups physically hurt even when we are over the person?

Co-regulation, sharing joy, awe and wonder