Snoring Is Worse In Winter. Why?

If your household has noticed that the snoring gets worse every winter, you are far from alone. For many people, snoring that is manageable through spring and summer becomes significantly louder, more frequent, and more disruptive as the temperature drops. There are real, physiological reasons for this. Understanding them is the first step toward doing something about it.

Dry Indoor Air: The First Culprit

One of the most immediate and underappreciated causes of worsening winter snoring is the air inside our homes. When we close windows, seal draughts, and run central heating systems to stay warm, we create an indoor environment that is warm but profoundly dry. This dry air has a direct effect on the upper airway tissues - the nasal passages, soft palate, uvula, and throat - causing them to become irritated, inflamed, and swollen.¹

Inflamed, swollen airway tissues take up more space. That reduces the already limited room available for airflow during sleep, increasing the turbulence of air passing through and amplifying the vibration of soft tissues that produces snoring. The body also responds to dry air by producing thicker, stickier mucus in an attempt to protect the airway, which further obstructs the nasal passages and worsens the problem.²

The simple fix is a bedroom humidifier. Maintaining adequate moisture in the air you breathe overnight can meaningfully reduce nasal irritation and tissue inflammation, and with it, snoring severity.

Winter Illnesses and Nasal Congestion

Winter is cold and flu season in Australia, and the respiratory illnesses that circulate through the community during these months are among the most significant seasonal drivers of snoring getting worse for some. When a cold, flu, or sinus infection causes nasal congestion, the nasal passages narrow and airflow through the nose becomes restricted or blocked entirely. The body compensates by switching to mouth breathing and that switch can have significant consequences for snoring and sleep apnoea.²

Mouth breathing during sleep bypasses the nose's natural filtering, warming, and humidifying functions, dramatically increases the collapsibility of the upper airway. Research confirms that nasal congestion is a significant risk factor for obstructive sleep apnoea, with large population studies identifying chronic nasal congestion as an independent risk factor for the condition.³ Even temporary congestion from a seasonal cold can worsen existing snoring into clinically significant sleep apnoea in predisposed individuals.

Seasonal Lifestyle Factors: Alcohol, Food, and Exercise

Winter doesn't just change the air, it changes our behaviour, and those behavioural changes compound the airway effects significantly.

Alcohol consumption tends to increase during the winter social season, with more frequent gatherings, shared meals, and the comfort of a drink on a cold night. Alcohol is a potent airway relaxant as it reduces the muscle tone of the throat and jaw, allowing the soft tissues to collapse inward more readily during sleep. Even moderate drinking within a few hours of bedtime can transform a mild snorer into a significant one, and can worsen existing sleep apnoea substantially.

Physical activity levels also tend to drop in winter. Regular exercise supports healthy body weight and muscle tone, both of which are protective against snoring. Less exercise, combined with the comfort foods and increased caloric intake that tend to accompany colder months, can lead to modest weight gain that places additional pressure on the tissues surrounding the upper airway. Even a small gain in weight around the neck and throat narrows the airway and increases snoring severity.

When Winter Snoring Is More Than Just a Season

For some people, louder snoring in winter is simply a seasonal inconvenience that improves when the warmer months return. For others, winter is the season that reveals a year-round problem that was previously less noticeable. If you are snoring loudly most nights, waking unrefreshed despite adequate time in bed, or being told by a partner that your breathing pauses during sleep, these are not seasonal symptoms - they are signs of obstructive sleep apnoea that warrant assessment regardless of the time of year.

Winter is actually an ideal time to seek assessment and treatment. You are likely spending more time indoors, social commitments are more manageable between major seasonal events, and adapting to a new oral appliance is often easier during the quieter winter period when you have time to establish new routines. A custom mandibular advancement splint, fitted by one of our sleep medicine dentists, is small, discreet, and effective year-round, regardless of what the weather is doing outside.

Practical Steps to Reduce Winter Snoring

There are several evidence-based steps you can take to reduce snoring this winter. Use a bedroom humidifier to add moisture to the dry indoor air. Stay well hydrated throughout the day to keep mucous membranes functioning well. Treat nasal congestion promptly with saline nasal sprays, which help clear the passages without the rebound congestion risk of decongestant sprays. Limit alcohol consumption in the hours before bed. Maintain your exercise routine even as the weather makes it less appealing. And if you sleep on your back, try sleeping on your side - a position that reduces the gravitational pull on the tongue and soft tissues into the airway.

If these measures are insufficient, or if your snoring is affecting your sleep quality or your relationship, it is time to speak to a SleepWise sleep medicine dentist. If you already have a mandibular advancement splint but it isn’t quite doing it’s best job for you, it’s time to book in a review today so we can help you get on top of it this winter.

Call SleepWise Clinic on 1300 101 505 to book a consultation or take our free online sleep apnoea test because a quieter winter starts with a better night's sleep.

Request for references: 1. ENT Center. 2. Harley Street ENT Clinic. 3. Michels et al. (2014)