Can Night Sweats Signal a Sleep Disorder?

Night sweats can be defined as excessive sweating during sleep that may soak a person’s pajamas or bed sheets. A room that is too warm or using a thick blanket can cause sweating at night. However, recurring night sweats that occur despite an appropriate room temperature and disrupt sleep may be associated with certain health conditions.

Sleep disorders are among the possible causes. In particular, obstructive sleep apnea is one of the sleep disorders associated with night sweats. However, night sweats alone do not mean that a person has sleep apnea or another sleep disorder. Hormonal changes, infections, certain medications, thyroid disorders, and other health conditions may also cause night sweats.

If night sweats are accompanied by loud snoring, pauses in breathing during sleep, waking up gasping for air, or excessive daytime sleepiness, evaluation for sleep apnea may be necessary.

This content is intended for general informational purposes. The cause of recurring or unexplained night sweats should be determined by a physician based on the person’s symptoms and medical history.

What Are Night Sweats?

Mild sweating during the night does not always indicate a health problem. A warm sleeping environment, thick clothing, or heavy bedding may increase body temperature and cause sweating.

In clinically significant night sweats, however, a person may sweat heavily enough to need to change their clothes or bed sheets. Recurrent sweating may also cause awakenings and disrupt the continuity of sleep.

Conditions that may cause or contribute to night sweats include:

• An overly warm sleeping environment
• Thick pajamas or bedding
• Menopause and hormonal changes
• Side effects of certain medications
• Anxiety and stress
• Thyroid disorders
• Certain infections
• Low blood sugar
• Alcohol consumption
• Certain neurological disorders
• Sleep disorders such as obstructive sleep apnea

Therefore, there is no single answer to the question, “What causes night sweats?” The frequency of sweating and the symptoms that accompany it are important in the evaluation.

Can Night Sweats Be a Sign of a Sleep Disorder?

Yes, in some cases, night sweats may be associated with a sleep disorder. However, a sleep disorder cannot be diagnosed based solely on night sweats.

Obstructive sleep apnea, which can cause breathing to repeatedly decrease or stop during sleep, is among the conditions in which night sweats may occur. Breathing disturbances caused by sleep apnea can repeatedly interrupt the normal sleep process throughout the night.

If night sweats occur together with the following symptoms, an evaluation of sleep quality and breathing during sleep may be considered:

• Loud and regular snoring
• Periods of silence during snoring
• Observed pauses in breathing during sleep
• Waking up choking or short of breath
• Frequent nighttime awakenings
• Dry mouth in the morning
• Morning headaches
• Feeling unrefreshed despite adequate sleep
• Excessive daytime sleepiness
• Attention and concentration problems

The presence of these symptoms does not confirm sleep apnea. However, when several symptoms of sleep apnea occur together with night sweats, a sleep evaluation may become more important.

Can Sleep Apnea Cause Night Sweats?

During sleep apnea, the upper airway may repeatedly narrow or temporarily close throughout the night. As a result, airflow may decrease, blood oxygen levels may fluctuate, and the body may trigger brief awakening responses to restart breathing.

This process may occur many times throughout the night. Even if the person does not remember most of these brief awakenings, the normal structure of sleep may still be affected.

The exact mechanism between sleep disorders and night sweats has not been fully clarified. However, night sweats may occur more frequently in some people with obstructive sleep apnea.

For this reason, sweating should not automatically be attributed to sleep apnea. Other nighttime and daytime symptoms should also be evaluated.

Do Night Sweats Affect Sleep?

Intense night sweats may cause a person to wake up during sleep. The need to change pajamas or bedding may make it difficult to fall asleep again and may interrupt overall sleep duration.

When this happens frequently, a person may feel unrefreshed in the morning even if they have spent enough time in bed.

Night sweats may lead to:

• Frequent sleep interruptions
• Difficulty falling back asleep
• Morning fatigue
• Daytime sleepiness
• Reduced attention and concentration
• Poorer sleep quality

However, it is important to distinguish cause and effect. In some people, night sweats disrupt sleep, while in others an underlying sleep or health condition may cause both sweating and poor sleep quality.

How Can Night Sweats Be Distinguished From Normal Sweating?

Sweating during sleep is not always considered “night sweats.”

Sweating caused by a warm room, a thick blanket, or warm sleepwear often decreases when environmental conditions are adjusted.

Night sweats that may require closer evaluation may involve:

• Heavy sweating despite a cool room
• Noticeably wet pajamas or sheets
• Waking up because of sweating
• Recurrent episodes of sweating
• Other nighttime or daytime symptoms

Recurring and unexplained night sweats, especially when accompanied by other symptoms, should be evaluated by a physician.

Which Symptoms Should Be Considered With Night Sweats?

When evaluating night sweats, attention should not only be paid to the amount of sweating but also to accompanying symptoms.

In particular, the following information may be useful:

• Whether snoring is present
• Whether pauses in breathing during sleep have been observed
• Waking up choking or gasping
• Morning headaches
• Excessive daytime sleepiness
• Fever
• Unexplained weight loss
• Palpitations
• Cough
• Significant fatigue
• Newly started medications
• Hormonal changes

Recording this information may help a physician evaluate possible causes of night sweats.

When Should You See a Doctor for Night Sweats?

Experiencing night sweats for one or several nights does not always indicate a serious health problem. If there is an identifiable cause, such as room temperature or a temporary illness, sweating may be short-lived.

However, medical evaluation may be appropriate if night sweats:

• Occur regularly
• Wake you from sleep
• Are severe enough to require changing pajamas or sheets
• Begin without an obvious cause
• Occur together with fever
• Are accompanied by unexplained weight loss
• Occur with symptoms such as persistent cough
• Are accompanied by snoring and pauses in breathing during sleep

Because night sweats may have many causes other than sleep disorders, the evaluation should not be limited only to sleep apnea.

What Should Be Done If Night Sweats Are Accompanied by Sleep Apnea Symptoms?

If night sweats occur together with snoring, pauses in breathing during sleep, or excessive daytime sleepiness, a physician may evaluate the possibility of sleep apnea.

During the evaluation, the following factors may be considered:

• Frequency of snoring
• Observed breathing pauses during sleep
• Nighttime awakenings
• Morning symptoms
• Daytime sleepiness
• Medications being used
• Accompanying health conditions
• Weight and physical characteristics

If sleep apnea is suspected, a home sleep test or a more comprehensive sleep study performed at a sleep center may be recommended depending on the person’s condition.

During a sleep test, parameters such as airflow, respiratory movements, blood oxygen level, and heart rate may be monitored to evaluate breathing events occurring throughout the night.

Are Night Sweats Alone Enough to Require a Sleep Test?

Not always. Because night sweats may be associated with many different conditions, the need for a sleep test cannot be determined based solely on this symptom.

However, if night sweats are accompanied by:

• Regular and loud snoring
• Pauses in breathing during sleep
• Waking up gasping or choking
• Morning headaches
• Feeling unrefreshed after sleep
• Excessive daytime sleepiness

an evaluation for sleep apnea may be considered.

The appropriate type of sleep test should be determined based on the person’s medical history, symptoms, and physician evaluation.

Evaluate Your Sleep Health With Happ Health

Night sweats are not always caused by a sleep disorder. However, if sweating is accompanied by snoring, pauses in breathing during sleep, waking up gasping for air, or excessive daytime sleepiness, breathing during sleep may need to be evaluated.

With the Happ Health Home Sleep Test service, provided with the assurance of Medical Park and Liv Hospital, breathing, oxygen levels, and related parameters can be recorded in your own sleeping environment.

The data obtained may help determine whether further evaluation for sleep apnea is necessary. Test results should be assessed by a physician together with your symptoms and medical history.

With Happ Health’s Health Everywhere, for Everyone, Always approach, you can take the first step toward evaluating your sleep health from the comfort of your home.