why do i sweat in my sleep
Last updated September 6, 2026.
**Most sleep sweating comes from a warm sleep environment, but fever, menopause, alcohol, anxiety, and certain medicines are also common causes.** Your body temperature normally drops as you fall asleep, so a warm room, thick blankets, or synthetic sleepwear can force you to sweat that heat off. Hot flashes during menopause or perimenopause, any illness that causes fever, low blood sugar in people taking diabetes medicine, and alcohol or heavy meals near bedtime all raise your odds of waking up damp. Medicines including SSRIs, some pain relievers, steroids, and hormone treatments list sweating as a known side effect. A cooler bedroom, cotton bedding, and skipping alcohol for a few hours before bed fix a large share of cases. Sweats that soak through your bedclothes night after night, or that come with fever, weight loss, or swollen glands, need a clinician's review.
What to do
- Cool the room first: Set the bedroom cooler than the rest of your home, use a fan, and swap heavy or synthetic bedding for breathable cotton.
- Cut evening alcohol: Alcohol widens blood vessels and disrupts sleep, so stop drinking at least three hours before bed and see if the sweats ease.
- Check your medicine list: Antidepressants, steroids, hormone treatments, and some pain relievers can cause sweating, so review your list with a pharmacist or clinician before changing anything.
- Track the pattern: Note how often it happens, whether your bedclothes are soaked, and any fever, weight change, or new symptom to bring to a visit.
- Rule out low blood sugar: If you take insulin or other diabetes medicine and wake sweaty, shaky, or with a headache, check your overnight glucose and tell your care team.
- Get seen promptly: Drenching sweats lasting more than a few weeks, or sweats with fever, unexplained weight loss, a lasting cough, or swollen glands need a clinician's evaluation.
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