Sleeping With Your Mouth Open: The Hidden Impact on Sleep

• Posted on: Mar 12 2026
• By: Sinus & Snoring Specialists

Mouth breathing, though a seemingly simple concern, has the potential to create significant concerns, particularly with sleep quality.

What are symptoms of mouth breathing?

Sleeping with your mouth open generally causes oral dryness. This can result in persistent bad breath, chapped lips, and waking with a sore throat. Hoarseness can also be seen if the irritation affects the throat and larynx. It can also increase the likelihood of dental issues and oral thrush (an overgrowth of fungus in the mouth).

Sleep quality can also be affected. This may cause restlessness, daytime fatigue, a feeling of “brain fog,” and difficulty concentrating. Snoring or noisy breathing can also be worse with mouth breathing. Chronic mouth breathing can also be a sign of obstructive sleep apnea, which is a condition where breathing during sleep is restricted by collapse or obstruction of the upper airway (which includes the nose, oral cavity, and throat).

How does mouth breathing affect sleep?

Breathing through the mouth during sleep can increase airway resistance. An open-mouth posture allows the tongue and jaw to fall backward toward the throat, narrowing the airway. This can worsen snoring and contribute to greater collapse of the soft tissues in the upper airway.

What are the causes of mouth breathing?

Generally, mouth breathing is caused by an inability to breathe consistently from the nose. This may be due to many reasons, including:

1. Deviated nasal septum: The nasal septum is the divider between the right and left sides of the nose. When it is deviated or bent, it can narrow one or both nasal passages and cause nasal obstruction.
2. Large turbinates: This refers to the enlargement of nasal turbinates, which are the structures inside the nasal cavity that help filter, warm, and humidify inhaled air. They can become enlarged due to untreated allergic rhinitis or chronic sinus infection.
3. Nasal valve insufficiency: Weakening of the nasal cartilage can cause the sidewalls of the nose to collapse inward during inspiration, leading to reduced airflow and nasal obstruction.
4. Large adenoid tonsils: In children, the adenoids are tonsillar tissue located in the posterior part of the nasal cavity. Although they typically begin to regress during adolescence, enlarged adenoids can be a significant source of nasal obstruction and congestion in younger children.
5. Colds and upper respiratory infections: These conditions can cause inflammation and swelling of the nasal and sinus passages, leading to temporary nasal congestion.
6. Allergies: Allergic inflammation can cause chronic nasal congestion, swelling of the nasal tissues, and increased postnasal drip.
7. Environmental factors: Low humidity, airborne irritants, and poor air quality can dry or irritate the nasal passages, making nasal breathing less comfortable and increasing the tendency toward mouth breathing.

How can this be improved?

Addressing the underlying cause can involve interventions like:

1. Addressing structural nasal issues: Structural problems within the nose can often be corrected with minimally invasive procedures. A deviated nasal septum may be treated with septoplasty to improve airflow. Enlarged turbinates can be reduced through a turbinate reduction. Nasal valve insufficiency may improve with external nasal dilators (such as Intake breathing strips) or in-office procedures like Vivaer, which stiffen and support the nasal sidewall cartilage. In children with enlarged adenoids, adenoidectomy can relieve nasal obstruction.
2. Prompt treatment of infections: Early diagnosis and treatment of upper respiratory infections, particularly sinus infections, can reduce inflammation and nasal blockage. When a bacterial sinus infection is suspected, treatment may include antibiotics, compounded nasal sprays, and other supportive therapies as appropriate.
3. Effective allergy management: Allergic rhinitis should be treated consistently to reduce chronic nasal inflammation. Nasal steroid sprays and antihistamine sprays such as azelastine® can significantly reduce symptoms, although they do not prevent allergic reactions entirely. Oral antihistamines may also help control symptoms. For long-term improvement, immunotherapy, such as allergy drops, can desensitize the immune system and reduce the severity of allergic responses over time.
4. Optimizing the environment: Improving indoor air quality can make nasal breathing more comfortable. Using a humidifier can prevent excessive dryness of the nasal passages, while air purifiers can reduce airborne allergens and irritants that contribute to nasal congestion

In short, mouth breathing can contribute to poor sleep quality. Proper evaluation by the providers at Sinus and Snoring Specialists can help address this problem and lead to more restorative sleep. Call or securely text our clinic today at 512-601-0303 to request an appointment.

Tagged with: dry mouth, mouth breathing, mouth breathing in kids, mouth taping, treatments for mouth breathing in kids

Posted in: Mouth Breathing, Snoring