# How to Breathe Correctly for Better Sleep and Performance
Breathing is one of the few bodily functions that occur automatically yet can also be consciously controlled. We do it approximately 20,000 times a day without thinking about it – and yet most of us breathe incorrectly. Not dramatically wrong, not in a way that's immediately visible, but in a manner that gradually and quietly affects sleep quality, stress levels, athletic performance, and overall health. The question, then, is: what would happen if we started paying even a fraction of the attention to our breath that we devote to diet or exercise?
The answer is surprisingly far-reaching. Research over the past two decades shows that the way we breathe – whether through the mouth or nose, whether shallowly or deeply, quickly or slowly – has a direct impact on the nervous system, hormonal balance, the quality of oxygen received by cells, and sleep architecture. And yet this topic is almost entirely overlooked in everyday life.
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The Nose Isn't Just for Show: What Happens When We Breathe Correctly
The nose is the primary breathing organ in humans, and for very good reasons. Air passing through the nasal cavity is filtered, humidified, and warmed to body temperature before it even reaches the lungs. The nasal mucosa captures dust, bacteria, and viruses, functioning as the immune system's first line of defense. That alone should be reason enough for people to stop mouth breathing – but the physiology goes even further.
The nose releases nitric oxide during breathing, a substance that has a crucial effect on vasodilation and oxygen transport throughout the body. This effect was described in detail by Swedish scientists from the Karolinska Institutet, who found that nitric oxide produced in the nasal cavities significantly increases the lungs' ability to absorb oxygen. In other words: even if the volume of air were the same, nasal breathing delivers more usable oxygen to cells than mouth breathing. This is a fundamental difference that manifests both during sports and in everyday activities.
Closely related to this is the so-called Bohr effect – a biochemical principle describing how oxygen is released from hemoglobin into tissues more efficiently in the presence of carbon dioxide. Many people don't realize that rapid, shallow mouth breathing leads to decreased CO₂ levels in the blood, which paradoxically worsens oxygen delivery to tissues. The body then responds by further accelerating breathing, creating a vicious cycle. The result is chronic fatigue, poor concentration, and the feeling that one never breathes enough – even though in reality, one is breathing too much.
Writer and investigative journalist James Nestor spent years studying the science of breathing and in his book Breath summarizes findings from dozens of scientific studies as well as his own experiments. One of his conclusions is simple yet apt: "The way we breathe literally changes the structure of our bodies." Nestor documents how the modern lifestyle – soft food, sedentary jobs, overheated rooms – has led humans as a species to forget how to breathe through the nose, and how this manifests in the narrowing of airways and the overall health of the population.
Breathing and Stress: How the Nervous System Responds to Every Breath
The connection between breathing and the nervous system is direct and immediate. Every inhalation activates the sympathetic nervous system – the one that governs the "fight or flight" response. Every exhalation, conversely, activates the parasympathetic nervous system, responsible for calm, recovery, and digestion. The tempo and depth of breathing therefore literally toggle between a state of alertness and a state of rest.
When a person experiences stress – whether it's work pressure, a family conflict, or just an overflowing inbox – breathing automatically speeds up and becomes shallower. The body uses this to prepare muscles for action, increase heart rate, and mobilize energy reserves. The problem arises when this state lasts hours or days without being followed by physical activity and genuine relaxation. Chronically accelerated breathing keeps the nervous system in a state of alertness, raises cortisol levels, and prevents the body from recovering.
The good news is that this mechanism works in reverse as well. Consciously slowing down breathing and extending the exhalation activates the parasympathetic nervous system and reduces the physiological stress response – within just a few minutes. This principle is used in techniques such as coherent breathing (approximately 5–6 breaths per minute), resonance breathing, or the 4-7-8 method, where the inhale is held for four seconds, the breath is retained for seven seconds, and the exhale lasts eight seconds. Scientifically supported results of these techniques have been described by researchers at the HeartMath Institute, who have long studied the relationship between heart rhythm, breathing, and emotional balance.
Take the example of Jan, a thirty-four-year-old project manager who suffered from chronic headaches and insomnia. After visiting a doctor who found no organic cause, Jan began working with a breathing therapist. It turned out that Jan was breathing an average of 18–20 times per minute (the norm is 12–16), predominantly through his mouth and almost exclusively into his chest. After six weeks of practicing nasal, diaphragmatic breathing, his breathing rate dropped to 10–12 breaths per minute, the headaches disappeared, and his sleep quality improved significantly. Jan's story is not exceptional – thousands of people who have consciously begun working with their breath describe similar experiences.
Diaphragmatic breathing plays a key role in the entire process. The diaphragm is the largest respiratory muscle, which when functioning properly massages the internal organs, supports the lymphatic system, and activates the vagus nerve – nervus vagus – the main communication channel between the brain and the gut. Shallow chest breathing barely engages the diaphragm, thereby missing out on a whole range of secondary benefits that proper breathing provides.
Sleep, Performance, and What Happens at Night
Perhaps the least explored yet most important topic is the effect of breathing on sleep quality. It is estimated that approximately 30% of the adult population suffers from some form of sleep-disordered breathing – ranging from mild snoring to upper airway resistance syndrome to obstructive sleep apnea, in which repeated breathing cessations occur. According to data from the World Health Organization, sleep disorders are a global health problem, and their connection to cardiovascular disease, diabetes, and depression is well documented.
Mouth breathing during sleep significantly increases the risk of snoring and sleep apnea because it reduces muscle tone in the pharyngeal area and alters pressure dynamics in the airways. Nasal breathing, on the other hand, keeps the airways more patent, increases oxygen saturation, and promotes deeper sleep stages, including REM, which is crucial for memory consolidation and emotional processing.
A simple but controversial tool that has gained attention in recent years is so-called mouth taping – taping the mouth shut before sleep with a special tape to force the body to breathe through the nose. The method has both detractors and advocates, and it is advisable to consult a doctor before trying it, especially if one suffers from chronic nasal congestion. Nevertheless, pilot studies, such as the one published in the Journal of Clinical Sleep Medicine, suggest that in patients with mild sleep apnea, this technique may reduce the apnea-hypopnea index and improve overall sleep quality.
As for athletic performance, the impact of breathing is equally significant, and more and more coaches and athletes are recognizing this. Nasal breathing during aerobic exercise slows the removal of CO₂, which – as described above – improves oxygen utilization in the muscles. Additionally, it forces athletes to maintain a slower, more controlled pace, which over the long term builds an aerobic base and reduces the risk of overtraining. Methods such as Buteyko or the approach of Patrick McKeown, author of The Oxygen Advantage, are now used by elite athletes around the world – from triathletes to rugby players.
Transitioning to nasal breathing during exercise is initially uncomfortable. The body, accustomed to large volumes of air through the mouth, must adapt to a lower breathing frequency. This adaptation typically takes two to four weeks and requires a temporary reduction in training intensity. The result, however, is usually significantly more efficient oxygen utilization, better recovery, and paradoxically even higher performance at lower perceived exertion.
So how do you get started? No expensive equipment or specialized course is needed. The first step is simply awareness – noticing how we breathe at rest, at work, while walking. Are we breathing through the mouth or the nose? Into the chest or into the belly? Is the breath quiet or audible? These simple questions can be surprisingly revealing. The second step is intentional slowing down – trying for five minutes a day to breathe exclusively through the nose, with an emphasis on a prolonged exhale. The third step is paying attention to the night and finding out whether we wake up in the morning with an open mouth, a dry throat, or a headache – these are clear signs of nighttime mouth breathing.
Breathing is the only autonomic bodily function that we have under direct conscious control. This exceptional quality makes it a powerful tool for influencing health – available to everyone, anytime, and free of charge. At a time when people spend thousands on supplements, special mattresses, and meditation apps, it seems almost ironic that one of the most effective health tools is literally right under our nose – or rather, directly inside it.
