Why Do I Sweat When I Sleep At Night?

When you find yourself sweating during sleep, it could be due to a variety of factors such as the temperature of your room, the heaviness of your blankets, or an underlying medical condition. It’s fairly normal to sweat during sleep if your sleep environment is too warm; however, if you find yourself waking up frequently drenched in sweat, it might be a symptom of nocturnal hyperhidrosis or “night sweats.” Night sweats can be harmless, or they can be indicative of a medical condition requiring a doctor’s attention.

Understanding Nocturnal Hyperhidrosis

Nocturnal hyperhidrosis, commonly referred to as night sweats, can seriously disrupt your sleep. It involves excessive sweating that isn’t necessarily related to heat or exercise. You may sweat so much that your pajamas and bedding become soaked, even when your sleeping environment is comfortable.

Possible Medical Causes of Night Sweats

Numerous medical conditions have been linked to night sweats. Some of them include:

Infections: Tuberculosis is the infection most commonly associated with night sweats. But, bacterial infections, such as endocarditis (inflammation of the heart valves), osteomyelitis (inflammation within the bones), and abscesses can cause night sweats as well.

Hormonal Imbalances: Disorders of the endocrine system, like diabetes and thyroid issues, can cause sweating. Menopause or perimenopause commonly causes hot flashes that may lead to night sweats.

Cancers: Night sweats can be an early symptom of some cancers. The most common type linked to night sweats is lymphoma. However, people who have an undiagnosed cancer frequently have other symptoms as well, such as unexplained weight loss and fever.

Medications: Certain medications can lead to night sweats as a side effect, with antidepressants being a common culprit. Other drugs, including those taken for diabetes and hormone therapy, can also cause sweating.

Neurological Conditions: Some neurological conditions, like autonomic neuropathy, stroke, and autonomic dysreflexia, may cause increased sweating and possibly lead to night sweats.

If you can’t attribute your night sweats to a warm sleep environment or a blanket that’s too heavy, you might want to consult a healthcare professional for further evaluation.

Environmental and Lifestyle Factors

Sometimes, sweating during sleep is merely a reaction to your sleeping environment or lifestyle choices. Here are some common factors to consider:

Room Temperature and Sleepwear

The ideal temperature for sleep is around 65 degrees Fahrenheit (18.3 degrees Celsius). A room that is too warm can cause you to sweat. The same is true for wearing sleepwear that is not breathable or using heavy, insulating blankets that don’t allow your body heat to escape.

Diet and Exercise

Your diet and evening activities can also play a role in how much you sweat during sleep. Consuming spicy foods, caffeine, or alcohol close to bedtime can increase your metabolism and your body temperature. Similarly, vigorous exercise too close to bedtime can elevate your body temperature and take a while to return to normal.

Improving Sleep Hygiene to Reduce Sweating

Improving your sleep hygiene can help minimize sweating and enhance the quality of your sleep. Here are some sleep hygiene tips:

Choose the Right Bedding: Use light, breathable sheets like cotton or moisture-wicking fabrics. These materials help regulate your body temperature throughout the night.

Control the Temperature: Keep your bedroom at a cool, comfortable temperature and consider using a fan or air conditioning during warmer months.

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Wear Appropriate Sleepwear: Opt for loose-fitting, moisture-wicking sleepwear to help keep you dry.

Avoid Sweat-Inducing Substances: Steer clear of alcohol, caffeine, and spicy foods before bedtime to prevent raising your internal body temperature.

When to Seek Medical Attention

If lifestyle changes and environmental adjustments don’t alleviate your night sweats, or if they occur with other symptoms, it’s important to consult a healthcare provider. Additional symptoms that warrant a doctor’s visit can include unexplained weight loss, fever, persistent cough, or pain.

Diagnosing the Underlying Condition

To determine the cause of night sweats, a doctor may:

Review your medical history: This includes medications, over-the-counter drugs, and supplements you’re taking.

Conduct a physical exam: This may involve checking for signs of infection or other visible symptoms that could correlate with excessive sweating.

Order tests: These might include blood tests, imaging studies, or other diagnostic procedures depending on the suspected cause.


The treatment for night sweats depends largely on the underlying cause. If medication is the source, your doctor may adjust your prescription or dosage. If an infection is to blame, antibiotics may be necessary. Hormone therapy may help if the sweating is due to menopausal hot flashes. In some cases, addressing anxiety or stress with relaxation techniques or counseling can help.

Alternative Solutions

In addition to medical treatments, other strategies can help manage night sweats:

Relaxation Techniques: Mindfulness meditation, deep breathing exercises, or gentle yoga before bed can reduce stress, which may help minimize sweating.

Stay Hydrated: Drinking enough water throughout the day can help offset some of the fluid loss due to sweating.

Finishing Thoughts

Sweating while you sleep can be uncomfortable and disruptive, but it is often manageable with the right approach. It’s essential to understand the myriad of factors that can contribute to nighttime sweating—from the tangible factors like room temperature and bedding to more serious health concerns. If you find that the common-sense adjustments to your sleep environment don’t improve your symptoms, don’t hesitate to reach out to a healthcare provider who can help identify any underlying medical issues. Remember, achieving a restful night’s sleep isn’t just a comfort; it’s a cornerstone of your overall health.


  • Aiden Lawrence

    I'm Aiden Lawrence, a certified Sleep Science Coach and senior editor of GoodSleepHub, proud parent of two amazing kids, and a pet lover with a cat and a dog. Join me as we explore the world of sweet dreams and comfy pillows. Let's make bedtime the highlight of your day!

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