Do you regularly wake up with an unpleasant feeling of a pasty mouth , a sore throat, and chapped lips ? Rest assured, you're not alone: approximately 1 adult out of 4 According to several epidemiological studies, dry mouth is a significant problem . Far from being harmless, this condition can disrupt your sleep and impact your oral health and overall well-being . Understanding the mechanisms behind this phenomenon is the first step towards enjoying peaceful nights and more comfortable awakenings . In this article, we explore the causes of dry mouth at night, identify associated symptoms , and discover practical solutions to effectively address it.
What causes a dry mouth at night?
Dry mouth at night has a medical name : nocturnal xerostomia . It is characterized by a subjective sensation of dry mouth during sleep, which may be related to a decrease in saliva production or other factors.
According to a Canadian survey , 23% of respondents say they wake up during the night to drink water, because of a dry mouth.
To fully understand this phenomenon, it's important to remember the role of saliva . As you probably know, it plays a fundamental role. It lubricates the mucous membranes , facilitates swallowing and protects your teeth against cavities by neutralizing bacterial acids.
During the night, saliva production naturally decreases compared to the daytime. This can cause a slight sensation of dry mouth upon waking , without major discomfort.
Nocturnal xerostomia is defined as the sensation of dryness becoming chronic and accompanied by symptoms such as a sticky mouth, a rough tongue, or difficulty swallowing .
This is a situation that should not be ignored, because in addition to disrupting your sleep, it may be hiding a serious health problem .
What are the main causes of dry mouth at night?
The causes of nocturnal dryness are multiple and can combine. Let's examine the most frequent factors.
1. Mouth breathing and snoring
Mouth breathing is one of the most common causes of nighttime dry mouth. Unlike nasal breathing, which naturally humidifies the air, mouth breathing directly exposes your oral cavity to the surrounding air, causing rapid evaporation of saliva . If you snore or suffer from sleep apnea , these conditions worsen the situation. The same is true for nasal congestion related to allergies or a deviated septum.
2. Medicines and medical treatments
Antidepressants , anxiolytics , antihistamines , decongestants , and antihypertensives are among the possible causes. Their use reduces salivary flow.
If you are undergoing cancer treatment , you may also be affected. Radiation therapy to the head and neck can damage your salivary glands . If you experience persistent dryness, talk to your doctor.
3. Dehydration or lack of hydration before bedtime
Insufficient hydration directly impacts nighttime saliva production. Your body needs adequatefluid intake to maintain all its physiological functions. Several other factors can amplify the sensation of dry mouth : alcohol consumption in the evening , excessive caffeine intake , and an overly dry environment (such as an overheated room in winter).
4. Age and hormonal changes
Aging is also an important factor to consider. More than 35% of adults over 60 report suffering from nighttime dry mouth, according to several scientific studies. Indeed, aging is accompanied by a decline in salivary gland function . If you are older, you are more likely to suffer from xerostomia, especially if you are taking multiple medications . In women, hormonal fluctuations related to pregnancy and menopause can also contribute. or menstrual cycles also influence the salivary glands.
5. Other possible causes
Several medical conditions can cause dry mouth:
- Sjögren's syndrome ( autoimmune disease);
- poorly controlled diabetes ;
- neurological diseases such as Parkinson's;
- Anxiety disorders and chronic stress .
Smoking and cannabis use are also aggravating factors that dry out the oral mucous membranes .
What are the symptoms associated with dry mouth at night?
Nighttime dry mouth causes various symptoms: irritated throat upon waking, hoarse voice, chapped lips, rough tongue and persistent bad breath.
You may also experience difficulty swallowing or a burning sensation in the mouth .
In the long term, chronic xerostomia increases the risk of dental caries , oral infections and gingival inflammation.
How to relieve dry mouth at night?
1. Good habits to adopt on a daily basis
- Drink enough water throughout the day (1.5 to 2 liters).
- Limit alcohol , caffeine, and spicy foods in the late afternoon and evening.
- Avoid tobacco and maintain impeccable oral hygiene with regular brushing and flossing.
- Use a humidifier in your bedroom , especially in winter, to maintain humidity between 40 and 60%.
2. Natural solutions and home remedies
Chew sugar-free gum or sugar-free xylitol candies to stimulate your salivary glands. Drink chamomile , mint , or ginger tea to soothe mucous membranes. Increase your intake of water-rich foods. like cucumbers and melons.
Some patients also describe their personal experiences on online forums. These accounts do not replace medical advice, but they do illustrate the daily experience of chronic xerostomia.
Testimonial: "My xerostomia is very severe and causes me immense suffering. In those moments, chewing xylitol-based gum... is the only thing that still gives me the illusion of hydration, and it's incredibly effective." Reddit
3. Available medical treatments and products
You can find saliva substitutes in pharmacies. (sprays, gels, lozenges) that reproduce the properties of natural saliva.
You can also use alcohol-free toothpastes and mouthwashes formulated for dry mouth . Your dentist may recommend nighttime fluoride gels .
In some cases, your doctor may prescribe sialagogue drugs (pilocarpine, cevimeline ) that stimulate saliva production.
Prevention: How to avoid having a dry mouth at night?
Maintain regular hydration rather than drinking large quantities all at once.
At the same time, establish a soothing bedtime routine and treat chronic nasal congestion by consulting an ENT specialist if necessary. Additionally, nasal strips can help ease nighttime breathing.
For snorers, monitoring will help diagnose possible sleep apnea .
Finally, monitor the side effects of your medications and have regular health check-ups.
When should you consult a healthcare professional?
Consult a doctor if dryness persists despite good hydration habits . Also consult if you notice a sudden increase in cavities , recurrent oral infections , or if the dryness is accompanied by other symptoms (excessive thirst, fatigue, joint pain). A complete examination will help rule out or diagnose conditions such as diabetes or Sjögren's syndrome.
FAQ – Frequently asked questions about dry mouth at night
Why is my mouth dry at night despite being well moisturized?
Mouth breathing, certain medications, or even an overly dry environment can be responsible, even with good hydration.
Is it serious to have a dry mouth at night?
Occasionally, no. Chronically, it can lead to cavities and infections, and may require a consultation.
What are some natural remedies for dry mouth?
Sugar-free chewing gum, herbal teas, water-rich foods, and a Humidifiers, for example, are effective.
Should I consult a dentist or a doctor?
The two are complementary: the dentist for oral and dental consequences, the doctor for systemic causes.
Bibliography
Agostini, BA, Cericato, GO, Silveira, ERD, Nascimento, GG, Costa, FDS, Thomson, WM, & Demarco, FF (2018). How Common is Dry Mouth? Systematic Review and Meta-Regression Analysis of Prevalence Estimates. Brazilian dental journal , 29 (6), 606–618. https://doi.org/10.1590/0103-6440201802302
Health Insurance. (2025, April 25). Dry mouth: definition, symptoms and causes . https://www.ameli.fr/assure/sante/themes/secheresse-bouche/definition-symptomes-causes
Thie, N.M., Kato, T., Bader, G., Montplaisir, J.Y., & Lavigne, G.J. (2002). The significance of saliva during sleep and the relevance of oromotor movements. Sleep medicine reviews , 6 (3), 213–227. https://doi.org/10.1053/smrv.2001.0183
Oksenberg, A., Froom, P., & Melamed, S. (2006). Dry mouth upon awakening in obstructive sleep apnea. Journal of sleep research , 15 (3), 317–320. https://doi.org/10.1111/j.1365-2869.2006.00527.x
Hosseini, MS., Sanaie, S., Mahmoodpoor, A. et al. Cancer treatment-related xerostomia: basics, therapeutics, and future perspectives. Eur J Med Res 29, 571 (2024). https://doi.org/10.1186/s40001-024-02167-x
Mascarenhas, MK, Cademartori, MG, Borges, RDC, Gonzalez, MC, Bielemann, RM, Thomson, WM, & Demarco, FF (2025). Prevalence and Associations of Xerostomia in Older Adults in Southern Brazil. Gerodontology , 42 (3), 405–415. https://doi.org/10.1111/ger.12808
Karimi, M., Hajikolaei, F.A., Hoseinpour, F., Hashemi, S.A., Fatehi, A., Pakmehr, S.A., Deravi, N., Naziri, M., Belbasi, M., Khoshravesh, S., & Vaezzadeh, S.H. (2024). Efficacy of Cevimeline on Xerostomia in Sjögren's Syndrome Patients: A Systematic Review and Meta-Analysis of Randomized Clinical Trials. Current therapeutic research, clinical and experimental , 102 , 100770. https://doi.org/10.1016/j.curtheres.2024.100770
Sardellitti, L., Bortone, A., Filigheddu, E., Serralutzu, F., & Milia, EP (2023). Xerostomia: From Pharmacological Treatments to Traditional Medicine-An Overview on the Possible Clinical Management and Prevention Using Systemic Approaches. Current oncology (Toronto, ON) , 30 (5), 4412–4426. https://doi.org/10.3390/curroncol30050336
u/Sjogrens. (sd). Sjogrens dry — extreme dry mouth resulted in panic [Message posted on an online forum]. Reddit. https://www.reddit.com/r/Sjogrens/comments/154usy6/sjogrens_dry_extreme_dry_mouth_resulted_panic/
Mortazavi, H., Baharvand, M., Movahhedian, A., Mohammadi, M., & Khodadoustan, A. (2014). Xerostomia due to systemic disease: a review of 20 conditions and mechanisms. Annals of medical and health sciences research , 4 (4), 503–510. https://doi.org/10.4103/2141-9248.139284
