If you find that you have a dental problem, you should adjust it promptly, otherwise it may cause your teeth to loosen and damage your gums.

3. Alternative medicine

If you find that your drooling is related to the medicine you are taking, you can talk to your doctor and ask if you can switch to another medicine, but remember not to change or stop taking the medicine on your own.

Drooling While Sleeping: 12 More Things to Know About the Causes, Warning Signs, and When to Seek Medical Help

Drooling during sleep is a common experience. Many people occasionally wake up with a little saliva on their pillow, especially after sleeping deeply or lying on their side. In most cases, it is harmless and does not indicate a serious health problem.

However, persistent or newly developed drooling in adults deserves attention, particularly when it occurs alongside difficulty swallowing, facial weakness, changes in speech, or other unusual symptoms.

The important thing is to distinguish ordinary nighttime drooling from symptoms that may point to an underlying medical condition.

Here are 12 additional things to understand about why drooling happens, what it may mean, and how to manage it safely.

1. Drooling Does Not Always Mean the Body Is Producing Too Much Saliva

One of the most common misunderstandings about drooling is that it always happens because the salivary glands are overactive.

In reality, there are two main possibilities:

• The mouth produces more saliva than usual.

• The person has difficulty keeping saliva inside the mouth or swallowing it regularly.

The second explanation is particularly important.

Healthy adults continuously produce saliva, even while sleeping. During waking hours, people swallow frequently without thinking about it. This keeps saliva from accumulating in the mouth.

During sleep, swallowing becomes less frequent. If the lips remain slightly open or the person sleeps on their side, saliva may escape onto the pillow.

Therefore, drooling does not necessarily indicate excessive saliva production. Sometimes it reflects changes in swallowing, lip closure, or sleeping position.

2. Nasal Congestion Can Make Nighttime Drooling More Likely

A blocked nose is a frequently overlooked reason for drooling during sleep.

When nasal passages become congested, people may breathe through their mouths instead. This can happen because of:

• Allergic rhinitis

• A common cold

• Sinus inflammation

• Nasal polyps

• A deviated nasal septum

When the mouth remains open during sleep, saliva can escape more easily.

Mouth breathing may also cause dryness, irritation, and an unpleasant taste when waking up.

If drooling occurs together with a blocked nose, sneezing, or frequent nighttime mouth breathing, addressing the nasal problem may help.

Persistent nasal obstruction should be evaluated, especially if it affects sleep or breathing regularly.

3. Sleep Apnea May Be Associated With Drooling

Obstructive sleep apnea is a condition in which the upper airway repeatedly becomes narrowed or blocked during sleep.

People with this condition may snore loudly, breathe through their mouths, wake up gasping, or experience repeated interruptions in breathing.

Mouth breathing and changes in swallowing during sleep can contribute to saliva escaping from the mouth.

However, drooling alone is not a reliable sign of sleep apnea.

Other warning signs include:

• Loud habitual snoring

• Witnessed pauses in breathing

• Waking up choking or gasping

• Morning headaches

• Dry mouth upon waking

• Excessive daytime sleepiness

People who recognize several of these symptoms should discuss them with a healthcare professional. A sleep study may be recommended to determine whether sleep apnea is present.

4. Difficulty Swallowing Can Cause Saliva to Accumulate

Swallowing is a coordinated process involving the brain, nerves, muscles, and structures in the throat.

When this process is impaired, saliva may accumulate in the mouth and escape through the lips.

Medical professionals call difficulty swallowing dysphagia.

Possible causes include:

• Neurological conditions

• Stroke

• Parkinson's disease

• Certain muscular disorders

• Structural problems affecting the throat or esophagus

Warning signs may include coughing or choking while eating, food feeling stuck in the throat, a wet or gurgling voice after swallowing, and repeated chest infections.

New or unexplained swallowing difficulties should be assessed rather than treated as ordinary drooling.

If someone suddenly develops difficulty swallowing together with facial weakness, speech changes, or weakness in an arm or leg, emergency medical help is needed.

5. Certain Medications May Increase Drooling

Medication is another possible factor.

Some medicines can increase saliva production, while others can affect the nervous system and reduce a person's ability to swallow efficiently.

Examples of medication groups that may be involved include:

• Certain antipsychotic medicines

• Some medicines used to treat neurological conditions

• Certain sedatives

• Some medications that influence muscle control

Clozapine, for example, is known to cause excessive salivation in some people.