8 benefits of breathing through your nose, and what the evidence says

Breathing through your nose cleans, warms and moistens the air before it reaches your lungs, and during sleep it keeps your upper airway easier to breathe through than mouth breathing does. Those are the best-supported benefits. A few others, like nitric oxide and a calmer nervous system, come from small studies and are worth knowing about without overselling.

Here are eight benefits, grouped by how solid the evidence is, plus what to do if your nose isn't doing its job at night.

What are the main benefits of nose breathing?

It filters the air on the way in

Your nose is built to catch things before they reach your chest. Cleveland Clinic explains that the turbinates, the structures along the inside of your nose, moisten and clean the air flowing through it. Researchers testing mouth tape in asthma described the same idea plainly: nose breathing ensures inspired air is warm, filtered and moist. The Sleep Foundation adds that nasal breathing can help filter allergens.

It warms and humidifies air before it reaches your lungs

Air that comes in through the nose arrives at your throat warmer and wetter than the room. In a 2000 study that measured humidity and temperature at different points inside the nose of 23 volunteers, the biggest rise in both happened in the front part of the nasal cavity, within a short distance of the nostrils. Nasal breathing vs. mouth breathing goes deeper on this.

It adds nitric oxide to each breath

Your sinuses produce nitric oxide, a gas that relaxes blood vessels. A 1995 study in Nature Medicine found it's made in the sinus lining at high concentrations, and the authors suggested it helps keep the sinuses free of bacteria. A 1996 follow-up noted that this nitric oxide reaches the lungs especially during nasal breathing, and in six of eight healthy people, a skin measure of oxygen was about 10% higher during nasal breathing than mouth breathing. These are small, older studies, so treat this as an interesting mechanism rather than a proven health effect. Our nitric oxide explainer covers what it does and doesn't show.

What are the benefits of nose breathing while you sleep?

It's your body's default route at night

Healthy adults with clear noses barely use their mouths to breathe while asleep. In a 2003 study of 10 people, only about 4% of the air they breathed in during sleep went through the mouth, and that didn't change between sleep stages. So nasal breathing at night isn't a trick or a hack. It's the normal setting, and mouth breathing is usually a sign that something, often a blocked nose, is pushing you off it. Bedtime itself plays a part. A 2022 meta-analysis of nine studies found that lying down increases nasal resistance and reduces airflow, and the effect was larger in people who snore or have sleep apnea, which may be why a nose that feels fine by day can feel tight in bed.

It keeps your airway easier to breathe through

Nose breathing keeps your airway easier to breathe through during sleep, and this is one of the clearest findings. In a 2003 sleep lab study of 12 healthy adults, upper airway resistance during sleep was a median of 12.4 units when they breathed through the mouth, compared with 5.2 through the nose. Awake, the two routes were about the same. The authors concluded the airway has a mechanical advantage during nasal breathing in sleep, which may explain why the body prefers it.

It keeps your mouth moist and less acidic

When your lips stay closed, saliva stays put. Cleveland Clinic says breathing through your nose helps keep moisture in your mouth and throat, and lists dry mouth and bad breath among the common symptoms of mouth breathing. In a small 2016 study, 10 people wore a nose clip to force mouth breathing during sleep. The average pH in their mouths dropped from 7.0 to 6.6, a change the authors noted has been proposed as a factor in tooth erosion and decay. That matters because saliva does real work overnight: the National Institute of Dental and Craniofacial Research says it washes food away from teeth and gums and contains minerals that help keep teeth strong, and that a dry mouth raises the risk of tooth decay. How mouth breathing affects your teeth has more.

It can mean less snoring

The Sleep Foundation explains that snoring often happens when someone breathes through the mouth, which can make the soft tissues in the throat vibrate. Cleveland Clinic lists snoring as one of the common symptoms of mouth breathing. Snoring has other causes too, and the Sleep Foundation notes that decades of research show people snore less on their side than on their back, so nasal breathing won't silence everyone. But for many people whose mouths fall open at night, it's a good place to start.

Which benefits are still early?

It may nudge your body toward calm

A 2023 study compared five minutes of nose-only breathing with five minutes of mouth-only breathing in 20 young adults at rest. During nasal breathing, average and diastolic blood pressure were slightly lower, and heart rate variability shifted toward the parasympathetic, or rest-and-digest, side. Systolic blood pressure and heart rate didn't change. It was one short session in healthy young people, so it says nothing yet about long-term health, but it fits with how calm slow nasal breathing tends to feel. Nasal breathing and stress covers the wider research.

Memory is another early thread worth watching. In a 2018 study, people who learned a set of smells and then rested for an hour breathing only through the nose recognized more of them afterward than when they rested breathing through the mouth. But a 2025 registered study using made-up words, with tape over the mouth for the nasal sessions, didn't find the same advantage. For now, it's an open question rather than a benefit to count on.

How do you get more nasal breathing at night?

To get more nasal breathing at night, start by making your nose easy to breathe through. Our two-minute nose test gives you a quick read, and 11 ways to breathe through your nose at night covers clearing congestion and setting up the bedroom.

If your nose feels narrow, a nasal strip gently lifts the sides open from the outside. A 2016 meta-analysis noted that nasal dilators have been shown to improve nasal breathing, though they didn't change sleep apnea measures.

If your nose is clear and your mouth still drifts open, mouth tape is a simple, gentle way to keep your lips together. The Sleep Foundation describes it as a reminder that promotes nasal breathing, while noting the research is still limited. A 2025 review warned of serious risk for people who tape with a blocked nose, so leave it off on congested nights. Skip it entirely and see a doctor if you snore loudly with choking, gasping or heavy daytime tiredness, which the Sleep Foundation lists as signs of sleep apnea. Tape and strips are for adults, not children.

Our pick: the Titan Sleep System (paid partner)

If you want both tools in one box, the set we recommend is the Titan Sleep System, which pairs TitanAir Nasal Strips with Titan Bamboo Silk Mouth Tape. Titan says the strips are drug-free with flexible spring-loaded bands, and that the tape is bamboo silk with an adhesive made to grip through stubble and beards. Titan suggests 20 to 30 minutes of daytime practice with the tape before your first night, says every batch is third-party tested and certified PFAS-free, and offers a 30-night guarantee.

For more, browse our nasal breathing articles.

Read next

• 9 effects of mouth breathing at night
• Does breathing through your nose improve sleep quality?
• How to start mouth taping

* This content is for informational and educational purposes only and is not medical advice. It is not intended to diagnose, treat, cure or prevent any disease or health condition. Talk to a qualified healthcare provider about your health.