The Boxing Day Crash – When Your Nervous System Finally Exhale

By Roger Hughes | EMDR Therapist & Trauma-Informed Life Coach

26th December 2025

Thank you for being here. If something in this article resonates with you and you’d like to talk, you’re very welcome to get in touch. You can also browse other articles or return to the homepage if you’d like to explore more. And if you’d like to leave a comment or suggest a future topic, I’d genuinely love to hear from you. Now, on to the article.

By the time Boxing Day arrives, most people don’t feel festive.

They feel… odd.

Not devastated. Not clinically depressed. Not “I need an intervention.” Just off. Flat. Irritable. Tired in a way sleep doesn’t seem to touch. Slightly empty. Slightly restless. Sitting on the sofa surrounded by the remains of what was apparently “a lovely day”, half-eaten chocolates you don’t want, a fridge full of food you’ll never eat, wrapping paper folded with the vague intention of reuse and then quietly binned later.

Someone says, “Shall we go for a walk?” like it’s a legal requirement. Someone else says, “I can’t be bothered,” and feels they should justify that statement with an entire TED Talk on fatigue. Someone scrolls their phone, watching other people apparently having a lovely time, experiencing that modern Christmas emotion: mild envy mixed with the suspicion that everyone is lying.

And somewhere underneath it all is a quiet, uncomfortable thought:
Why don’t I feel better now it’s over?

This is the Boxing Day slump. It isn’t a failure of gratitude, mindset, or festive spirit. It’s what happens when a nervous system that’s been running on effort for weeks realises the pressure has lifted, and stops. To understand why Boxing Day feels the way it does, you have to rewind. The slump doesn’t begin on the 26th. It begins long before the turkey, in the build-up I’ve been writing about across the last three posts.

This Boxing Day piece is the follow-on, the fourth part, where everything we’ve covered, the pressure, the coping, the memory, finally has a consequence. Not because Christmas is “bad”, but because it’s intense, and the nervous system has a way of collecting receipts.

On 22 December, in Christmas Isn’t a Holiday — It’s a Nervous System Test, I called out the first uncomfortable truth: Christmas is not relaxing. It’s marketed that way, described that way, spoken about as if everyone naturally drifts into warmth and connection once the decorations go up. From a nervous system point of view, though, it’s closer to an endurance event with tinsel.

December is full of demands that don’t look dramatic enough to call “stress”, but quietly require constant regulation. Remembering dates. Managing money. Organising travel. Navigating family dynamics. Performing cheer. Not disappointing anyone. Pretending you’re fine with things you’re not fine with. Even the good bits require effort. Enjoyment takes energy. Social connection takes energy. Hosting takes energy. Smiling politely at a difficult relative’s opinions takes a frankly heroic amount of nervous system regulation.

Your nervous system doesn’t register this as festive. It registers it as load. So what most people are doing in December isn’t relaxing, they’re bracing. Bracing looks calm from the outside. You’re functioning. You’re getting things done. You’re coping. But underneath, the system is slightly tightened, slightly alert, slightly “on”. Not panicked. Just not settled. And because everyone around you is doing the same thing, it feels normal. You tell yourself, “It’s just Christmas.” Which is true, and exactly the point.

By the time Christmas Day arrives, many people aren’t calm. They’re just highly practised at holding it together.

Then, on 23 December, in Relief-Seeking vs Regulation: Why Christmas Wears You Out, I wrote about what people do next and how they cope when that bracing becomes chronic. When the nervous system is under sustained load, it looks for relief, not regulation. Relief is quick. Regulation is slow. Relief says: eat something, drink something, buy something, scroll something, stay busy, keep moving, push through. Regulation says: slow down, feel your body, notice what’s happening, tolerate stillness, let yourself settle.

Guess which one most people choose in December.

Relief isn’t wrong. It’s human. And it works in the short term. It takes the edge off and makes things bearable. But it comes at a cost. Relief burns energy to get through the moment. It doesn’t replenish It’s like using your overdraft and telling yourself you’ll sort it out in January, while quietly ignoring how long you’ve been doing that. And if we add a tiny bit of science without turning this into a lecture: many “relief” behaviours are quick dopamine nudges. Small hits of “better for five minutes” that keep you upright and vaguely civil. Useful in the moment. Not the same as recovery.

So Christmas becomes a strange paradox. On the surface, there’s abundance: food, drink, lights, noise, novelty. Underneath, the nervous system is quietly becoming more depleted. People say things like, “I’ll relax after Christmas,” or “Once it’s over, I’ll feel better.” What they usually mean is: once the pressure stops, they’re hoping the body magically recovers. Spoiler, it doesn’t.

Then, on 24 December, in The Ghost of Christmas Past — How Old Wounds Shape Your Nervous System at Christmas, I added the third layer, the one people don’t plan for. The one that turns a “nice family day” into something that leaves you oddly activated, withdrawn, or quietly raw without being able to explain why.

Christmas doesn’t just activate the present. It activates the past.

Smells. Sounds. Songs. Roles. Seating arrangements. Family scripts. The way someone looks at you when you say no. The tone they use when they say your name. The nervous system doesn’t do nostalgia. It does pattern recognition. So Christmas has a habit of quietly pulling old material forward: attachment wounds, unresolved grief, family dynamics that never really changed. You might notice it as feeling younger than you are. Or suddenly reactive. Or emotionally flat. Or oddly tearful at an advert for a supermarket, which is always an irritating moment because now you’re crying about mince pies and you have to pretend it’s “just tiredness.”

From the outside, it can look like moodiness. From the inside, it feels like being hijacked. This isn’t weakness. It’s conditioning. Your body doesn’t care that you’re 40, 50, or 60 now. If the environment feels familiar enough, it reacts as if it’s still navigating old terrain.

So by Christmas Day evening, many people have been doing three things at once: bracing against current pressure, leaning on short-term coping, and remembering things they didn’t consciously invite.

All at once. Which brings us neatly to Boxing Day. Because Boxing Day is where the nervous system finally cashes the cheque.

Boxing Day is strange because the contrast is sudden. The build-up collapses overnight. The schedule evaporates. The guests leave. The noise drops. The performance ends. No more “shoulds”. No more pretending this is the best time of the year.

And the nervous system finally clocks it. We can stop now. This is where people expect to feel calm. Instead, many feel flat. Not because something has gone wrong, but because the chemistry that kept you going has dropped. Adrenaline fades. Dopamine dips. Cortisol reduces. The system moves out of mobilisation. What replaces it isn’t instant peace, it’s often emptiness, fatigue, irritability, or numbness.

This is the Boxing Day crash. Not dramatic. Not catastrophic. Just deeply underwhelming. It’s the moment when people look around and think, “Is this it?” The tree is still there. The lights are still on. You’re technically still on holiday. But your body is behaving like you’ve just completed a forced march. This is where people get confused, because the story we’re told is that Christmas is joyful and restorative. Therefore, Boxing Day should feel warm, cosy and content. Instead, it often feels like someone has removed the batteries from your soul. The nervous system doesn’t fall apart during pressure. It falls apart after.

During December, people are held together by structure, obligation, momentum and social expectation. On Boxing Day, that scaffolding disappears. And whatever the system has been holding becomes visible. That’s why rest can feel uncomfortable. Stillness can feel wrong. Doing nothing can trigger guilt. Quiet can feel unsettling rather than soothing.

If you want a simple nervous system frame: December is often sympathetic “go-go-go” with bursts of forced cheer, and Boxing Day is the attempted swing back toward parasympathetic “stop now.” But if your system hasn’t learned that stopping is safe, it doesn’t feel like peace. It feels like collapse, irritation, or emptiness.

You see it in the small behaviours people fall into on Boxing Day. Opening the fridge repeatedly like it’s going to offer emotional solutions. Tidying things that don’t need tidying. Picking at leftovers while saying, “I’m not really hungry,” which is Boxing Day code for “I’m trying to self-soothe.” Sitting down, standing up, scrolling aimlessly, half-watching a film.

Some people become irritable in that oddly specific Boxing Day way, where everything is fine but also everything is annoying. Chewing noises feel unbearable. Cheerful comments land badly. Someone asks, “What shall we do today?” and you feel the urge to reply, “Nothing. Just nothing.”

Some people go numb. Some feel sad without knowing why. Some feel restless but can’t summon energy. Some are desperate to “make the most of it” and end up recreating the same pressure they were trying to escape. The nervous system doesn’t care about intentions. It responds to load. This isn’t laziness or a lack of motivation. It’s a nervous system that hasn’t learned that rest is safe.

For some people, Boxing Day is genuinely better. The pressure lifts. Expectations drop. There’s space to breathe. They enjoy the quiet, the pyjamas, the lack of plans, the gentle day that doesn’t demand anything. For others, Boxing Day is harder than Christmas Day itself. The distraction is gone. The noise has faded. And the cost of December shows up all at once, as emptiness, fatigue, irritation, sadness, or an emotional hangover that doesn’t match the “special time” narrative.

Neither response is wrong. Boxing Day doesn’t create the slump. It reveals it. The nervous system doesn’t care that it’s a bank holiday. It responds to load, safety, and meaning, not tradition. So if you feel flat, empty, or irritable on Boxing Day, it doesn’t mean you failed Christmas. It means your nervous system finally stopped pretending. Your exhaustion isn’t a flaw. Your emptiness isn’t ingratitude. Your irritation isn’t a personality defect. It’s information. For many people, Boxing Day is the first honest moment of the season. Not joyful. Not dramatic. Just truthful.

Which is why January shows up the way it does. January is the month of declarations. This year will be different. This year you’ll slow down. This year you’ll set boundaries. This year you’ll prioritise yourself. Gyms fill. Notebooks are bought. Apps are downloaded. Vision boards are made. Someone you haven’t spoken to since school posts a photo of a green smoothie with the caption “New year, new me,” and you briefly consider moving to a remote island.

And then, quietly, life resumes. The problem isn’t that people don’t know what needs to change. Most people are painfully aware. The problem is that insight alone doesn’t regulate a nervous system. You can understand yourself perfectly and still keep doing the same things when pressure hits, because the system defaults to what it knows.

January plans are often made from exhaustion rather than capacity. People don’t fail because they’re lazy. They fail because nothing about the system underneath has changed, only the intention layered on top. It’s like putting a motivational quote on a car with an empty fuel tank and acting surprised when it doesn’t go anywhere. Real recovery doesn’t come from dramatic resets. It comes from small, boring, unglamorous shifts. Less bracing. More honesty. Fewer obligations. Clearer limits. Actual rest, not just the absence of work. Safety, not just relief. Repair, not just distraction. By February, many people are back where they started, wondering why they’re tired again.

What if Boxing Day isn’t a problem to fix? What if it’s a message? What if that flatness is simply the nervous system saying: That was a lot. I need something different. Not louder. Not better. Just different.

Boxing Day doesn’t ask you to reinvent your life. It asks you to notice how your body responds when the noise stops, what shows up when the performance ends, and whether rest feels safe, or like something you have to earn. That noticing, awkward and unglamorous as it is, is often where real change quietly begins.

Because the Boxing Day slump isn’t weakness. It’s your nervous system telling the truth. And if you can hear it, you can start to do something different in January, not in a dramatic, performative “new me” way, but in a steady, real, sustainable way. That’s the point of this entire series. Christmas isn’t a holiday. It’s a nervous system test. Relief isn’t regulation. Old wounds still show up. And Boxing Day is where your system finally stops holding its breath. If any of this has landed with that quiet internal “Yes… that,” take it seriously. Not as a reason to judge yourself but as a reason to understand yourself. Your body is not being difficult. It’s being honest. And that honesty is where recovery starts.

It’s worth saying this clearly, because it matters: this isn’t an argument against Christmas. Christmas can be wonderful. For some it’s genuinely a time of joy, connection, warmth, laughter, and rest. For others it’s neutral, or difficult, or a mix of all three. None of those experiences are wrong. What this series has been doing isn’t judging Christmas as a concept. It’s simply naming what often happens inside the body and nervous system under prolonged pressure and emotional demand, even when wrapped in tinsel and goodwill. And if you can hear it, you can start to do something different in January, not in a dramatic, performative “new me” way, but in a steady, real, sustainable way. That’s the point of this entire series. Christmas isn’t a holiday. It’s a nervous system test. Relief isn’t regulation. Old wounds still show up. And Boxing Day is where your system finally stops holding its breath.

If any of this has landed with that quiet internal “Yes… that,” take it seriously. Not as a reason to judge yourself, but as a reason to understand yourself. Your body is not being difficult. It’s being honest. And that honesty is where recovery starts.

This is where trauma-focused approaches, including EMDR, can be helpful, not because there’s something “wrong” with you, but because the nervous system sometimes needs help updating old information. EMDR works with how memory, emotion, and physiology are stored, helping the brain and body recognise the present is different from the past. It’s not about reliving Christmases gone by. It’s about allowing the system to stand down when it no longer needs to be on guard. There’s no requirement to do anything with this insight. No pressure to make January transformational. The invitation is simpler than that. Just notice. Notice what your body does when things slow down. Notice what feels hard. What feels relieving. What you override or rush past. Those observations aren’t failures, they’re data. And data, handled gently, is where real change begins.

If the Boxing Day slump has shown you something about yourself, you don’t have to act on it immediately. You can hold it lightly. Carry it into the new year with curiosity rather than judgement. Christmas will come around again. The question is not whether you’ll do it “better” next time, but whether your nervous system will feel a little more supported, less braced, and more at home in your own body when it does. That, quietly, is the work.

The nervous system is not a moral system. It doesn’t reward you for being grateful or punish you for being human. It responds to patterns, load, safety, and threat. When something is intense, even when positive, the body still has to process it. When something touches older experiences, even gently, the body still responds.

From a biological point of view, none of this is surprising. Sustained sympathetic activation, the “go, cope, organise, perform” state, isn’t designed to run indefinitely. At some point, the system has to shift gear. When that shift happens suddenly, without enough safety or support, it can feel less like rest and more like a drop in energy or motivation. That isn’t dysfunction. It’s physiology doing what it’s meant to do. What matters isn’t whether you had a “good” Christmas by anyone else’s standards. What matters is what your body registered once things slowed down.

For some people, that awareness is enough. They make practical changes. They soften their pace. They stop expecting to recover instantly. They allow January to be quieter and less performative. Over time, the nervous system learns slowing down doesn’t equal danger. For others, the patterns are older and more established. The body has learned, often for very understandable reasons, that rest is uncomfortable, slowing down brings unease, or that certain times of year reactivate things that were never fully integrated. In those situations, insight alone can only go so far.

This is where trauma-focused approaches, including EMDR, can be useful, not because there is something “wrong” with you, but because the nervous system sometimes needs support to update old information. EMDR works with how memory, emotion, and bodily responses are stored, helping the brain and body recognise that the present is not the same as the past. It isn’t about revisiting old Christmases. It’s about allowing the system to respond appropriately to what’s happening now.

There’s no obligation to do anything with this understanding. No requirement to change yourself. No pressure to turn January into a self-improvement project. The invitation is simpler. Just notice. Notice what your body does when things slow down. Notice what feels uncomfortable. Notice what feels settling. Notice what you tend to override. Those observations aren’t criticisms, they’re information. And information, handled with care, is where genuine change begins.

If the Boxing Day slump has highlighted something about how you operate, you don’t have to act on it immediately. You can hold it lightly. You can carry it into the new year with curiosity rather than judgement. Christmas will come around again. The question isn’t whether you’ll do it “better” next time. It’s whether your nervous system will feel a little more supported, less braced, and more settled in your own body when it does. And what you choose to do with that awareness is entirely yours. You might change nothing at all. You might make one small adjustment. You might simply listen to yourself with a bit more kindness. There’s no correct response, only the one that fits your life. What matters is that you now have a clearer sense of what your body has been communicating. And that awareness, held gently, isn’t a burden. It’s a resource. And that, quietly and positively, is where things begin.