Why Do People Drool When They Sleep?

Occasional drooling in your sleep is normal, but frequent or excessive saliva on your pillow may signal a condition called hypersalivation.

This happens when saliva production continues at night instead of slowing down. But why does this occur, and when should it be a concern?

Let’s look at the common causes of drooling during sleep and what you can do about it.

The Common Causes of Drooling When Sleeping

Hypersalivation, or excessive drooling, is a medical condition called sialorrhea. Poor oral and facial muscle control is a common reason. This could be the result of one of the following causes.

1. Sleeping Position

While side and stomach sleeping may be the two most popular sleeping positions, they are also the most likely cause of drooling when you sleep.

Even if you don’t suffer from excessive saliva production, drool has a greater opportunity of pooling in your mouth in either sleep position — which means there’s a high chance it’ll escape from the front or side of your mouth. If you have a habit of mouth breathing while sleeping or if you have narrow nasal passages, the chances of drool escaping as your lips part to breathe increases.

Using a pillow that doesn’t provide adequate neck and head support can cause your mouth to open more during sleep, further increasing the likelihood of drooling. Choosing an ergonomic or contoured pillow can help keep your head aligned and reduce saliva leakage.

When you sleep on your side or stomach, gravity works against you. Saliva naturally collects at the lowest point in your mouth, and if your lips part even slightly, drool can leak out. 

Moreover, if you have a tendency to sleep with your mouth open due to nasal congestion or other breathing difficulties, this further increases the likelihood of waking up to a wet pillow.

2. Sleep Apnea

Sleep apnea is a sleep disorder where you stop breathing for a few seconds when you’re sleeping. There are three different types of sleep apnea:

The irregular breathing caused by all three types of sleep apnea tends to encourage excessive saliva production and mouth breathing, which can, in turn, lead to drooling easily escaping from your open mouth.

Untreated sleep apnea can lead to chronic fatigue, memory issues, and an increased risk of cardiovascular disease. If you suspect sleep apnea, it’s crucial to seek medical attention to improve both sleep quality and overall health.

When airflow is repeatedly interrupted due to apnea episodes, the body instinctively compensates by opening the mouth to breathe. This not only increases the likelihood of drooling but also leads to a dry mouth upon waking. 

Also, sleep apnea is linked to poor sleep quality, which can contribute to morning headaches, difficulty concentrating, and increased fatigue throughout the day.

Other symptoms of sleep apnea include snoring, feeling sleepy during the day, and having a sore throat or dry mouth in the morning.

3. Gastrointestinal Reflux Disorder

Heartburn and acid reflux are two of the more common symptoms of gastrointestinal reflux disorder (GERD). GERD can cause you to regurgitate what you’ve eaten back into your esophagus, and make it difficult for you to swallow as you’ll feel like food is returning into your mouth, leaving an acidic or bitter taste.

When stomach acid flows back into the esophagus, it can irritate the throat and mouth, triggering the salivary glands to produce excess saliva. This excessive saliva production increases the chances of drooling while sleeping, particularly if you sleep in a position that allows saliva to pool in your mouth.

Chronic acid reflux can also cause inflammation in the throat and vocal cords, leading to hoarseness, coughing, and excessive mucus buildup. If you experience nighttime reflux, raising the head of your bed, avoiding heavy meals before sleep, and reducing caffeine intake may help manage symptoms.

Your body also increases its saliva production to try to flush out the irritation in your esophagus, therefore increasing the chances of drooling when you sleep.

4. Allergies and Infections

Allergic reactions, sinus infections, and sinus problems caused by mold, pollen, or the common cold often result in nasal congestion, which in turn creates breathing difficulties, as well as an increase in saliva production to flush any toxins out.

When seasonal allergies or infections cause postnasal drip, mucus buildup in the throat can also lead to increased swallowing difficulties. This, in turn, can make it harder for saliva to be managed properly, increasing drooling at night.

While nasal congestion blocks normal airflow, it forces you to breathe through your mouth while sleeping, increasing the likelihood of drooling. Seasonal allergies, respiratory infections, and chronic sinus conditions like sinusitis can all contribute to increased mucus production and difficulty swallowing.

Also, if you’re suffering from strep throat or tonsillitis, you’ll probably have trouble swallowing, which means saliva has an increased chance of escaping your mouth while you sleep.

5. Swallowing Disorders

Neurological disorders such as Parkinson’s disease and stroke, or medical conditions such as cerebral palsy or Bell’s palsy can result in swallowing disorders, also called dysphagia. All of these health problems will often result in a loss of control of facial or oral muscles, which can create problems in swallowing.

Dysphagia makes it difficult to move saliva down the throat, leading to saliva buildup in the mouth. When swallowing is impaired, saliva has no choice but to escape from the mouth, causing excessive drooling. 

Conditions such as ALS (amyotrophic lateral sclerosis), multiple sclerosis, and traumatic brain injuries can also contribute to dysphagia and drooling. This can weaken the muscles responsible for swallowing, further increasing saliva retention and drooling. If drooling is accompanied by difficulty speaking or chewing, a neurologist should be consulted for evaluation and management.

6. Side Effects of Medications

Some drugs can actually induce drooling, which according to Dr. Alicia Roth can be a side effect both while you’re awake and while you sleep. The most common of which are those used to treat psychiatric disorders and Alzheimer’s disease, as well as some antibiotics.

Medications that increase saliva production or affect muscle control can contribute to nighttime drooling. These include:

• Psychiatric medications (e.g., antipsychotics, antidepressants)
• Medications for Alzheimer’s disease
• Certain antibiotics

If you suspect your medication is causing excessive drooling, consult your healthcare provider for alternatives.

7. Other factors causing people to drool in sleep

Several other factors can contribute to excessive drooling while sleeping. These factors may not always indicate a serious health issue but can still lead to discomfort or disrupted sleep.

• Age – Infants and toddlers drool frequently as they haven’t fully developed their swallowing reflexes. In adults, aging can lead to weakened facial and throat muscles, reducing swallowing efficiency and increasing drooling, especially during sleep.
• Diet – Certain foods can stimulate saliva production, leading to excessive drooling at night. Spicy and acidic foods (like citrus fruits and hot peppers) increase saliva flow, while dairy products (such as milk and cheese) can cause thickened mucus, making it harder to swallow saliva properly before sleep.
• Deep Sleep – When a person enters deep sleep (REM sleep), their body’s muscles, including those in the face and mouth, relax significantly. If the mouth naturally falls open in this state, saliva can easily escape, leading to drooling.
• Pregnancy – Hormonal fluctuations during pregnancy, especially in the first trimester, can lead to increased saliva production (a condition called ptyalism). Additionally, morning sickness and nausea can make it harder to swallow excess saliva, increasing the chances of drooling at night.
• Deviated Septum – A misalignment of the nasal septum (the cartilage separating the nostrils) can make nasal breathing difficult. As a result, people with a deviated septum often resort to mouth breathing, which increases saliva leakage during sleep.
• Bruxism and Mouth Breathing – Teeth grinding (bruxism) and habitual mouth breathing can contribute to excessive drooling. Bruxism can cause jaw misalignment, affecting how saliva is distributed and swallowed, while chronic mouth breathing prevents saliva from being properly regulated.

Complications That Arise From Drooling When Sleeping

There are physical and psychological complications that arise from frequent drooling. These include:

How to Stop Drooling When Sleeping?

Drooling when sleeping doesn’t have to be a condition you live with. There are a number of treatment options available to stop or prevent drooling and help you get better sleep.

1. Change Your Sleeping Position

The first thing you could try if you find you’re drooling when you sleep is to change your sleeping position. Sleeping on your back can help to direct saliva flow back into your mouth, reducing the chances of it pooling in your mouth or flowing out when you’re sleeping.

Using a memory foam pillow or an adjustable wedge pillow can provide extra support and help keep your head in an optimal position to prevent drooling.

2. Mouth Devices

Mouth devices such as a continuous positive airway pressure (CPAP) machine or mandibular advancement device are commonly used to help with sleep apnea.

A CPAP machine helps to keep your airway open while you sleep by blowing air with continuous pressure down your throat, potentially reducing the occurrence of drool when you sleep.

The mandibular device looks like a mouthguard and is designed to improve sleep and reduce drooling and snoring. It adjusts the positioning of your tongue and encourages your mouth to close.

3. Medication

If you’re suffering from sinus allergies and reactions, taking the appropriate medication to relieve symptoms can help you to breathe better and therefore reduce any chances of drooling when you sleep. Anticholinergic medications such as scopolamine can also be used to help reduce drooling.

4. Primary Health Care Providers

If you have a serious drooling or swallowing problem, or if you suffer from a neurological condition, there are health care providers who can help, including:

• Speech pathologists, who can offer speech therapy to help improve jaw stability and tongue strength and mobility to help you close your mouth fully.
• Occupational therapists, who can suggest postural changes to improve your ability to swallow.
• Neurologists, who can suggest alternative medications if you’re suffering from dementia or Alzheimer’s and taking medication that’s causing excess drooling.

5. Surgery

Getting your salivary glands surgically removed is the last resort option since as earlier mentioned, they do play an important role in keeping us healthy. However, if most other treatments have not worked and you’re still suffering from excessive drooling, surgery may help to curb hypersalivation.

So, Why Do I Drool When I Sleep?

Consistently waking up to a wet pillow doesn’t have to be an unavoidable fact of life. In fact, it’s often a sign something needs to change or be addressed, and as you can see, there are some simple treatment options available.

Drooling during sleep is a common issue, but it isn’t something you have to live with forever. Understanding the root cause—whether it’s sleep position, allergies, a medical condition, or even medication side effects—can help you find an effective solution. 

In many cases, simple lifestyle adjustments, such as sleeping on your back, managing sinus congestion, or using a CPAP machine, can significantly reduce nighttime drooling.

However, excessive drooling can also signal an underlying health issue that may require medical attention. Sleep apnea, swallowing disorders, or neurological conditions like Parkinson’s disease can all contribute to drooling in ways that simple changes may not fix. If you’ve tried adjusting your habits and still wake up with a soaked pillow, it’s time to look deeper into potential medical causes.

However, the answers to why you drool in your sleep are varied, so it’s important to determine if there’s an underlying medical condition. If the changes you’ve made or treatment options you’ve tried don’t work, speak to your doctor about alternative solutions.

While occasional drooling is normal, excessive or persistent drooling could indicate a more serious issue. Consider seeking medical advice if:

• You experience severe, constant drooling despite making lifestyle changes.
• You have difficulty swallowing (dysphagia) or frequently choke on saliva.
• Drooling is accompanied by loud snoring, choking, or gasping for air—signs of possible sleep apnea.
• Your drooling is linked to neurological symptoms, such as muscle weakness or difficulty speaking.
• Drooling has led to skin irritation, dehydration, or social embarrassment affecting your quality of life.

A healthcare provider can help identify the underlying cause and recommend appropriate treatments, ranging from speech therapy and medication to medical devices or, in rare cases, surgery. Addressing excessive drooling not only improves sleep quality but can also enhance overall comfort and well-being.

FAQs

What is Drooling?

Drooling, also known as sialorrhea, is the unintentional flow of saliva from the mouth. It occurs when excess saliva builds up and isn’t swallowed efficiently, leading it to escape from the lips. 

While drooling is common in infants due to their developing muscles, persistent or excessive drooling in adults may be linked to sleep position, nasal congestion, neurological conditions, or medication side effects. It can also be a symptom of underlying health issues, such as swallowing disorders or sleep apnea.

What is the outlook for drooling?

The outlook for drooling depends on its cause. If it results from minor factors like sleeping position, allergies, or sinus congestion, it can often be managed with lifestyle adjustments. However, if drooling is due to a medical condition such as sleep apnea, neurological disorders, or dysphagia, treatment may be necessary to prevent complications like dehydration, skin irritation, or aspiration pneumonia. 

In most cases, addressing the underlying issue through medication, therapy, or medical devices can significantly reduce drooling and improve quality of life.

What does drooling in your sleep mean?

In your sleep, drooling typically means that saliva is accumulating in your mouth without being swallowed. This can be caused by an open-mouth posture due to nasal congestion, improper sleeping positions (such as sleeping on your side or stomach), or increased saliva production.

In some cases, it may indicate an underlying medical issue, such as sleep apnea, GERD, or neurological disorders affecting swallowing. While occasional drooling is normal, frequent or excessive drooling may warrant lifestyle changes or medical evaluation to determine the root cause.

Is drooling in sleep good or bad?

Drooling during sleep isn’t necessarily bad—it can be a sign of deep, relaxed sleep. However, excessive drooling could indicate an issue such as poor swallowing control, sleep apnea, or mouth breathing due to sinus congestion. While minor drooling is harmless, chronic drooling can lead to discomfort, skin irritation, dehydration, and even embarrassment. 

If drooling disrupts your sleep, causes frequent wet pillows, or is accompanied by other symptoms like snoring or difficulty swallowing, it’s worth investigating potential causes and seeking treatment if necessary.

Does anxiety cause drooling in sleep?

Yes, anxiety can contribute to drooling in sleep, although it’s not a direct cause. Anxiety can lead to increased saliva production, mouth breathing, or teeth grinding (bruxism), all of which can increase the likelihood of drooling. Additionally, stress can cause muscle tension or affect swallowing reflexes, leading to saliva buildup. 

Some medications prescribed for anxiety, such as antidepressants or sedatives, may also contribute to excess saliva production. Managing anxiety through relaxation techniques, breathing exercises, or therapy may help reduce drooling related to stress.

How to Control Drooling in Your Sleep?

Controlling drooling in your sleep involves addressing its root cause. Start by adjusting your sleeping position—sleeping on your back can help prevent saliva from escaping. If nasal congestion forces you to breathe through your mouth, use decongestants, saline sprays, or humidifiers to clear your airways. 

Practicing tongue and swallowing exercises can improve muscle control. If sleep apnea or GERD is the cause, medical treatment may be necessary. In severe cases, doctors may prescribe medications, therapy, or medical devices to reduce excessive drooling.

When should drooling be treated by a healthcare provider?

You should seek medical attention if drooling becomes excessive, persistent, or is accompanied by other symptoms like difficulty swallowing, choking, or breathing issues. If drooling disrupts your sleep, leads to dehydration, skin irritation, or social embarrassment, it may be a sign of an underlying condition. Additionally, if drooling is associated with neurological disorders, such as Parkinson’s disease or stroke, professional evaluation is necessary. A healthcare provider can determine the cause and recommend appropriate treatments, such as therapy, medication, or medical devices, to manage symptoms.

What can I do at home to treat drooling?

To manage drooling at home, try sleeping on your back and using a firmer pillow to keep your head elevated. If you have nasal congestion, use a humidifier, nasal sprays, or allergy medication to clear your airways. Hydrate properly and avoid eating spicy or dairy-heavy foods before bed, as they can increase saliva production. 

Swallowing exercises can strengthen mouth muscles, helping you control saliva flow. If drooling persists despite these changes, consulting a doctor can help identify additional treatment options.