Night sweats affect 10% to 41% of adults seen in primary care settings, making them one of the most common sleep complaints. The good news is that most cases trace back to fixable causes: your sleep environment, what you consumed before bed, a medication side effect, or a hormonal shift. Here’s how to identify your triggers and reduce or eliminate nighttime sweating.
Why Night Sweats Happen
Your brain’s hypothalamus acts as your body’s thermostat, constantly adjusting sweat output to keep your core temperature stable. During sleep, your body naturally cools itself by about one degree, and sweating is part of that process. Night sweats happen when something pushes that system into overdrive, whether it’s an external trigger like a warm room, an internal one like fluctuating hormones, or a disruption to your sleep cycle itself.
Anything that fragments your sleep can worsen sweating. Conditions like sleep apnea, restless legs, or chronic pain cause repeated shifts between lighter and deeper sleep stages, and those transitions can destabilize your body’s temperature regulation. Research at Mayo Clinic found that severe hot flashes and night sweats in middle-aged women were linked to a higher risk of obstructive sleep apnea, suggesting the two problems often feed each other.
Cool Your Bedroom to 60–67°F
The single most effective environmental change is lowering your room temperature. Sleep experts at Cleveland Clinic recommend keeping your bedroom between 60 and 67°F (15 to 19°C). If you’re currently sleeping at 72°F or higher, even dropping to 68°F can make a noticeable difference. A fan or open window works if air conditioning isn’t an option.
Your bedding matters just as much as air temperature. Swap synthetic sheets for cotton or linen, which wick moisture instead of trapping it. If you sleep under a heavy comforter, try layering thinner blankets you can kick off as needed. Wear lightweight, loose-fitting sleepwear, or skip it entirely.
Cooling Mattress Pads
Active cooling mattress pads, which circulate temperature-controlled water beneath you, have shown real results. In a study of 38 menopausal and perimenopausal women, a water-cooled mattress pad reduced nighttime hot flash frequency by 54%, dropping episodes from an average of 1.78 per night to 0.75. About 65% of the women at least halved their nightly hot flashes. A separate trial using a passive cooling pad (no electricity, just heat-absorbing materials) found a similar 52% reduction. These pads won’t necessarily help you sleep longer or deeper, but they do reduce the sweating episodes themselves.
Cut Back on Alcohol and Caffeine
Alcohol dilates your blood vessels and increases blood flow to the skin, which ramps up heat loss and triggers sweating. Even a single glass of wine within a few hours of bedtime can be enough to set off night sweats in people who are prone to them. The effect is dose-dependent: more drinks mean more vasodilation and more sweating.
Caffeine is a stimulant that raises your metabolic rate and core body temperature. If you’re dealing with night sweats, try cutting off caffeine by early afternoon and eliminating alcohol for two weeks to see if your symptoms improve. Spicy foods can also trigger a similar flushing response, so keep those to earlier in the day as well.
Check Your Medications
Up to 20% of people taking antidepressants experience excessive sweating, often concentrated on the scalp, face, neck, and chest. The sweating tends to come in episodic bursts and frequently persists throughout treatment. Certain antidepressants are more likely to cause this problem than others. If your night sweats started or worsened after beginning a new medication, that timing is a strong clue.
Beyond antidepressants, other common culprits include fever-reducing medications (which can cause rebound sweating), hormone therapies, blood pressure drugs, and diabetes medications that lower blood sugar. Don’t stop any prescription on your own, but do raise the issue with your prescriber. Switching to a different medication in the same class often resolves the problem.
Address Hormonal Changes
Menopause is the most well-known hormonal trigger. Up to 80% of middle-aged women experience hot flashes and night sweats as estrogen levels fluctuate. These vasomotor symptoms typically peak in the years surrounding your final period and gradually ease over time, though for some women they persist for a decade or longer.
Layering the environmental strategies above, particularly a cool room, breathable bedding, and a cooling mattress pad, can meaningfully reduce the frequency and severity of hormonal night sweats. Hormone replacement therapy is effective for severe cases, and several non-hormonal prescription options exist as well. Hyperthyroidism, low testosterone in men, and blood sugar swings from diabetes can also cause night sweats, all of which are treatable once identified.
A Practical Elimination Approach
Since night sweats often have multiple contributing factors, a systematic approach works best. Start with the changes that cost nothing: drop your thermostat to 65°F, switch to lighter bedding, and stop alcohol and caffeine for two weeks. Track whether your sweats improve, stay the same, or disappear.
If they persist, review any medications you take and discuss alternatives with your doctor. If you’re in the age range for hormonal shifts (typically mid-40s to mid-50s for women), that’s worth evaluating too. People who snore heavily, wake up gasping, or feel exhausted despite a full night of sleep should consider a sleep apnea screening, since treating the apnea often resolves the sweating.
When Night Sweats Signal Something Serious
Most night sweats are benign, but certain patterns warrant prompt medical attention. Drenching sweats that soak through your sheets, combined with unexplained weight loss, persistent fevers, or swollen lymph nodes in your neck, armpits, or groin, are known as “B symptoms” and can indicate lymphoma or another malignancy. Night sweats accompanied by a persistent cough and fever may point to an infection like tuberculosis or endocarditis. If your sweats are new, severe, and unexplained by any obvious trigger, getting a workup that includes blood tests is a reasonable step.