Waking up sweaty can be as simple as sleeping under a heavy comforter—or a sign that something else deserves attention. Here is how to tell the difference and what to try first.
Why do I sweat in my sleep?
It is normal to sweat when the bedroom or bedding is too warm. The NHS defines night sweats as sweating that soaks clothing and bedding despite a cool sleeping environment. There are many possible causes, and a symptom alone cannot identify one.
- Heat and bedding: A warm room, thick pajamas, a heavy duvet or an insulating mattress can trap heat.
- Hormonal changes: Hot flashes during perimenopause and menopause can occur at night and interrupt sleep.
- Medicines and substances: Some antidepressants, steroids and pain medicines can contribute, as can alcohol or drug use. Discuss changes with the prescriber; do not stop prescribed medication on your own.
- Other health conditions: Anxiety, low blood sugar, infections and an overactive thyroid are possible causes. Less commonly, serious conditions can be involved.
What can help you sleep cooler?
- Adjust the room first. Use a fan or air conditioning if available and choose a temperature that feels comfortable; there is no single ideal setting for everyone.
- Layer lightly. Swap a heavy comforter for a lighter blanket you can add or remove. Loose sleepwear and breathable sheets may feel more comfortable.
- Notice patterns. Keep a short record of sweating, room temperature, alcohol, symptoms and medication changes to discuss with a clinician.
- Review your sleep surface. If your mattress traps heat, breathable bedding or a different mattress may improve comfort, but cooling products do not treat a medical cause. Compare our cooling mattress guide and menopause and night-sweats mattress guide.
When should you see a healthcare professional?
Arrange an appointment for recurring night sweats that wake you, soak your bedding, or cause concern. Mention fever or chills, a persistent cough, diarrhea, unexplained weight loss, new medicines and any other changes. A clinician can review your history and decide whether testing or treatment is appropriate.
For someone with diabetes, sweating can be a symptom of low blood sugar. Follow your own diabetes care plan and seek urgent help for severe symptoms such as confusion, seizure or loss of consciousness.
Frequently asked questions
Can a mattress cause night sweats?
A heat-retaining mattress can make you feel hot and sweaty, but recurrent drenching sweats in a cool room deserve medical attention. Changing bedding may improve comfort without addressing an underlying condition.
Are night sweats always caused by menopause?
No. Menopause is one possible cause, but medicines, anxiety, infections and other conditions can also play a role.
Will cooling sheets stop night sweats?
They may feel less stuffy, but results vary and no sheet can guarantee an end to sweating. Treat marketing claims as comfort claims, not medical treatment.
Sources: NHS: Night sweats; NHS: Menopause symptoms. This guide is educational and does not replace personalized medical care.