UARS and the Nervous System: An Earlier Working Theory

Here is something that took me years to piece together — and I want to be honest from the first line that this is my interpretation of my own case, not settled medicine.

The way I understand it now: my nervous system didn't know I had a narrow airway. It didn't know about UARS, or PMDD, or endometriosis, or any particular diagnosis. It only registered that something, night after night, wasn't right.

There is real research behind part of this. Studies of restricted and disrupted sleep have found increased activity in the body's stress systems — the sympathetic nervous system and the HPA axis — including higher morning cortisol after experimentally fragmented sleep (Meerlo and colleagues, 2008; Balbo and colleagues, 2010). The honest caveat: those studies describe modest, measurable shifts, mostly short-term. They don't prove the bigger story I'm about to tell.

But when I looked at my own years of effortful breathing at night, pain flares, and hormonal crashes — all landing on the same body, all at once — I stopped believing it was a coincidence that I felt permanently braced. Wired. Unable to settle, even on the quiet days.

What It Felt Like for Me

It didn't feel like a textbook description. It felt like this:

Waking up exhausted no matter how long you slept. Moving through the day like you're wading through something thick. A body that aches without clear cause. Hands and feet that are cold when they shouldn't be.

A sense of dread before the day has started. Being easily startled, easily overwhelmed, easily undone by things that shouldn't matter. Feeling "on edge" and flat at the same time — wired but too depleted to do anything with the wiring.

"I want to want to do things," is the best way I've found to describe certain days. Not depression exactly. Something more like a system that has run out of capacity.

How I Make Sense of It

The basic physiology is standard textbook material. The nervous system has two broad branches: the parasympathetic side — rest, digest, repair — and the sympathetic side — alert, activated, mobilised.

What the research supports is narrower than what I'm about to say: disrupted sleep has been linked with a shift towards sympathetic activity and increased stress-hormone output, at least in the short term (Meerlo and colleagues, 2008; Balbo and colleagues, 2010).

My personal interpretation goes further, and I want to flag it as exactly that. When I lived for years with sleep that fragmented every single night, a hormonal cycle that swung into crisis every month, and pain my body had learned to anticipate — it felt like my baseline itself had moved. Like being on guard had become the default setting rather than the emergency one.

For me, the most useful reframe was: it's not that I was an anxious person. It's that my body had adapted to conditions where staying on guard made sense, for a long time.

Whether that's precisely what was happening in my physiology, I can't prove. But it fit my experience better than anything else I was offered, and it changed how I treated myself.

The Layer That Makes It Worse

For me there was another layer, and I suspect I'm not alone in it.

Years of not being believed. Of having my pain dismissed. Of fighting to be taken seriously in medical settings. Those experiences weren't just emotionally painful — the way I understand it now, they taught my body something. That help might not come. That expressing need brings judgement.

So by the time I finally got answers, I wasn't starting from neutral. I was starting from a system that had already spent years braced. The illness didn't create that — it amplified what was already there.

I sometimes wonder if this is part of why two people with the same diagnosis can have such different experiences of severity. I can't say that as fact. I can only say that in my case, the history mattered as much as the airway.

One thing I'll say plainly: working through that kind of history is not something I'd attempt from a blog post — mine or anyone's. If it's live for you, that work belongs with a qualified therapist.

What You Cannot Force

I spent years trying to relax my way out of dysregulation.

Meditation, breathwork, all the correct things. But I was approaching them as tasks to complete. As another way to push my body into behaving correctly.

That was the trap, for me. I could not force my nervous system to feel safe. Safety wasn't a performance I could deliver. It was a state that emerged — slowly, through consistent experience, through the body rather than around it.

"Calming isn't something I force. It's something that emerges when the body isn't being scrutinised."

That took me a long time to understand. And the understanding itself didn't fix anything — it just meant I stopped adding self-criticism to an already depleted system.

What Helped Me

Consistency over intensity. Five minutes of breathwork every day did more for me than an hour-long session once a month ever did. My sense is that whatever settling happened, it happened through repetition — the gradual accumulation of moments where nothing was wrong.

Gentleness over agenda. Practices done without pressure to produce a result. Movement because it felt good, not because it was supposed to fix me.

Normalcy. Time that was not about recovery at all. A walk. Good music. An easy conversation. I needed stretches of not being a sick person, not just better ways of tolerating being one.

And time. More time than felt reasonable. After years of running on survival mode, months were not enough. That's not a study finding — it's just what it took, for me.

Sources and review

I last went back over this post on 19 August 2026. The research I actually leaned on here is thin by design — most of this piece is lived experience, not literature:

• Meerlo, Sgoifo and Suchecki, Restricted and disrupted sleep: effects on autonomic function, neuroendocrine stress systems and stress responsivity, Sleep Medicine Reviews, 2008.
• Balbo, Leproult and Van Cauter, Impact of sleep and its disturbances on hypothalamo-pituitary-adrenal axis activity, International Journal of Endocrinology, 2010.

To be clear about where the line sits: those papers support a link between disrupted sleep and short-term increases in stress-system activity. Everything beyond that — the idea that my baseline shifted, that my history primed it, that gentleness and time retrained it — is my personal conclusion from my own case, not established medicine. Please treat it that way.

Not a doctor. This is my personal experience. If any of this resonates, the occasional newsletter is where I share what I'm learning — and replies there reach me.