Why You Hold Your Breath Without Realizing It (And What To Do About It)

Why You Hold Your Breath Without Realising It

You are probably not breathing properly right now. Not because anything is wrong with you. But because you are reading this on a screen, and screens have a strange, well-documented effect on the way we breathe.

It is called screen apnea. The term was first used by Linda Stone, a former senior executive at both Apple and Microsoft, who noticed in 2007 that she was unconsciously holding her breath every time she sat down at her computer. Not occasionally. Routinely. For hours.

Curious whether this was just her, Stone spent seven months observing friends, colleagues and volunteers while they used screens. She monitored their pulse and heart rate variability. What she found was striking: roughly 80% of participants either held their breath or breathed in a shallow, restricted pattern while they worked at a screen.

The 20% who did not? Former military test pilots, triathletes, and professional performers like dancers, singers, and a cellist. In other words, people who had been explicitly trained to maintain their breathing while concentrating under pressure.

The rest of us were never taught that.

What actually happens when you hold your breath at a screen

Here is the basic chain reaction. You sit down at your laptop, open your inbox, and a cluster of emails arrives. You inhale in anticipation. But you do not exhale. More emails come in, another notification pops up, and your breath stays suspended. Your posture collapses forward. Your diaphragm compresses. Your breathing becomes shallow and chest-based rather than slow and abdominal.

This is not a neutral event. Shallow breathing and breath-holding activate the sympathetic nervous system, your body's fight-or-flight response. The brain interprets the disrupted breathing pattern as a sign of threat and responds accordingly: adrenaline and cortisol are released, heart rate increases, blood pressure rises, and digestion slows.

Linda Stone, writing in the Huffington Post (2008), citing conversations with researchers at the National Institutes of Health

Now consider this: the average person spends approximately 6 hours and 40 minutes per day on screens. In the US, that figure sits at around 7 hours. If 80% of people unconsciously restrict their breathing during screen use, that is a significant portion of your waking life spent in a low-grade stress state that you did not choose and probably are not even aware of.

The vagus nerve connection

Stone's original research led her to the vagus nerve, one of the 12 cranial nerves and arguably the most important one for day-to-day regulation. The vagus nerve accounts for roughly 75% of the entire parasympathetic nervous system, the branch responsible for rest, recovery, digestion, and bringing the body back to baseline after stress.

When you breathe slowly and deeply, particularly with a longer exhale than inhale, you stimulate the vagus nerve. This signals the brain that conditions are safe, heart rate slows, blood pressure drops, and the body shifts from sympathetic (alert) to parasympathetic (settled) dominance.

When you hold your breath or breathe shallowly for hours at a time, you are doing the opposite. You are keeping the vagus nerve quiet and the sympathetic system running. Not at full intensity like a panic attack, but at a constant low hum. Think of it as leaving your stress engine idling all day.

Why this matters more than you think

Most conversations about breathing focus on what to do when you are already stressed. Box breathing during a panic attack. A body scan before bed. A guided exercise when you are overwhelmed. Those tools are genuinely useful and worth having.

But screen apnea points to a different, quieter problem. It is not about the acute moments of stress. It is about the six or seven hours a day where your nervous system is being nudged into alert mode without your knowledge or consent. This kind of chronic, low-level sympathetic activation has been connected to elevated cortisol, reduced heart rate variability, disrupted digestion, poor sleep, and a general sense of being tired and wired that many people have come to accept as normal.

Research published in StatPearls (National Library of Medicine) describes how chronic stress leads to sustained activation of the sympathetic nervous system and HPA axis, resulting in elevated cortisol and adrenaline. Over time, this promotes inflammation, suppresses immune function, and can contribute to cardiovascular risk, disrupted sleep, and metabolic changes.

And the frustrating part is that most of this is preventable. Not with a complicated wellness routine, but with awareness and a few basic tools.

What you can actually do about it

The first step is just noticing. Right now, as you read this, check: is your jaw clenched? Are your shoulders lifted? Is your breath sitting in the top of your chest? Most people who learn about screen apnea recognise it in themselves immediately. That recognition alone starts to shift the pattern.

Beyond awareness, there are a few practical things that help.

Exhale longer than you inhale. This is the single most reliable way to activate the vagus nerve and shift your nervous system toward rest. A pattern like breathing in for 3 counts, holding for 2, and exhaling for 6 is a good starting point. It takes about 60 seconds and you can do it without anyone around you noticing.

Set a breathing checkpoint. Every time you open your email or unlock your phone, take one conscious breath. Not a dramatic deep breath. Just a normal, full inhale and a slow exhale. Attaching the habit to something you already do dozens of times a day makes it more likely to stick.

Fix your posture before you fix your breath. When you collapse forward over a screen, your diaphragm compresses and your breathing becomes chest-based by default. Sitting upright or standing does not guarantee good breathing, but it makes it physically possible for the diaphragm to move freely.

Use a guided breathing tool. When you do have a few minutes, using a guided exercise takes the thinking out of it. You follow the cue, the breath slows, and the nervous system gets the reset it has been missing. Even a few minutes of structured slow breathing can meaningfully shift the balance from sympathetic to parasympathetic.

The bottom line

You do not need to overhaul your life to breathe better. But you probably do need to become aware that something is happening to your breathing every time you sit down at a screen. Screen apnea is not a diagnosis. It is a pattern. And once you see it, you can interrupt it.

The 80% of people in Stone's research who held their breath were not sick or broken. They were just never taught to notice. The 20% who breathed freely had one thing in common: at some point, someone had taught them how to stay in their body while their attention was elsewhere.

That is a learnable skill. And it might be one of the most underrated things you can do for your nervous system.

Sources and further reading

Stone, L. (2008). "Just Breathe: Building the Case for Email Apnea." Huffington Post. huffpost.com

Stone, L. (2014). "Are You Breathing? Do You Have Email Apnea?" lindastone.net

NPR Body Electric (2024). "Screen time causes shallow breathing. Here's how to fix screen apnea." npr.org

Harvard Health Publishing (2024). "Understanding the Stress Response." health.harvard.edu

American Psychological Association (2023). "Stress Effects on the Body." apa.org

National Library of Medicine / StatPearls (2024). "Physiology, Stress Reaction." ncbi.nlm.nih.gov

U.S. Department of Veterans Affairs, Whole Health Library. "The Power of Breath: Diaphragmatic Breathing." va.gov

Wikipedia (2025). "Email Apnea." en.wikipedia.org

DemandSage (2026). "Average Screen Time Statistics." demandsage.com