Waking up with sweaty clothes or damp bedsheets can be uncomfortable. Some sweating is normal, especially when the weather is hot or the bedroom is poorly ventilated. However, repeated episodes of heavy night sweating may have several possible explanations.
1. Hot sleeping conditions: Thick blankets, heavy clothing and warm rooms are common reasons for sweating during sleep.
2. Hormonal changes: Menopause can cause hot flushes and night sweats. Other hormonal changes may also affect temperature regulation.
3. Certain medicines: Some antidepressants, pain medicines and other prescribed drugs may cause increased sweating. Never stop medication without medical advice.
4. Infections: Some infections can cause fever and night sweats. Other symptoms and the duration of the problem help determine whether investigation is needed.
5. Low blood sugar: People using insulin or certain diabetes medicines may experience low blood sugar overnight, sometimes with sweating and shaking.
6. Anxiety and stress: Emotional stress can affect the nervous system and contribute to sweating during sleep.
7. Other medical conditions: Thyroid disorders and, less commonly, certain cancers can cause night sweats. Sweating alone does not mean someone has cancer.
What can you do? Use breathable nightwear, keep your bedroom comfortable and record when the sweating happens. Notice whether other symptoms occur at the same time.
Final thoughts: If night sweats repeatedly soak your clothes or bedding, or occur with fever, unexplained weight loss, persistent cough or swollen glands, arrange a medical assessment. The cause should be investigated rather than guessed.
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