Most night sweats come down to your body overheating during sleep, and the most effective prevention targets the specific reasons that happens. For some people, the fix is as simple as lowering the thermostat or swapping out bedding. For others, night sweats signal a hormonal shift, a medication side effect, or a dietary trigger that needs a different approach. Here’s what actually works.
Keep Your Bedroom Between 60 and 67°F
Your body naturally drops its core temperature as you fall asleep, and a warm room fights that process. Sleep specialists at the Cleveland Clinic recommend keeping your bedroom between 60 and 67°F (15 to 19°C) for adults. That range feels cool when you first climb into bed, but it aligns with your body’s overnight thermoregulation.
If you share a bed with someone who prefers warmth, a fan pointed at your side of the bed or a cooling mattress pad can create a microclimate without freezing out your partner. Mattress pads with phase change materials absorb and release heat to keep your skin at a more stable temperature throughout the night. Active cooling systems that circulate water through a pad offer more aggressive temperature control for people with severe sweating.
Choose the Right Fabrics
What you sleep in and on matters more than most people realize. Traditional polyester traps heat against your skin. Natural fibers like cotton, bamboo, and linen have hollow cores that wick moisture away from your body through capillary action. The tradeoff is that these natural fibers eventually saturate if sweating is heavy, which is why many purpose-built sleepwear blends combine them with synthetic moisture-wicking materials.
Bamboo and linen have the added benefit of natural antimicrobial properties, which helps with the odor that comes from repeated sweating. For sheets, look for the same principles: breathable weaves (percale rather than sateen) in natural or blended fibers. Heavy memory foam pillows also trap heat around your head and neck, so switching to a ventilated or gel-infused pillow can make a noticeable difference.
Cut the Dietary Triggers
Alcohol, caffeine, and spicy food are the three most common dietary causes of night sweats. Alcohol widens blood vessels in your skin and increases your heart rate, both of which trigger perspiration. Even moderate drinking in the evening can produce sweating hours later as your body metabolizes the alcohol overnight.
Caffeine is a stimulant that raises core body temperature and can linger in your system for six or more hours. An afternoon coffee may not keep you awake, but it can push your body temperature just high enough to cross the sweating threshold during sleep. Spicy foods containing capsaicin activate the same heat receptors, essentially tricking your nervous system into thinking your body needs to cool down. If night sweats are a regular problem, try eliminating all three for two weeks to see if the pattern changes.
Losing Weight Reduces Sweating Frequency
Higher body fat acts as insulation, raising your core temperature and making it easier to trip the sweating response. Multiple studies have found that people with a higher BMI report more frequent and more severe night sweats. A clinical trial from UCSF found that women in an active weight loss program were twice as likely to see improvement in their hot flashes after six months compared to women who didn’t lose weight. Reductions in weight and abdominal circumference were both independently associated with fewer episodes.
This doesn’t mean you need to reach an ideal weight to see benefits. Even modest fat loss, particularly around the midsection, can lower core body temperature enough to make a measurable difference. One counterintuitive finding: exercise itself can temporarily increase night sweats by raising core temperature, so timing matters. Working out earlier in the day gives your body more time to cool down before bed.
Hormonal Night Sweats in Menopause
If your night sweats started around perimenopause or menopause, the mechanism is different from simple overheating. Declining estrogen narrows the temperature range your brain considers “normal.” In premenopausal women, the body tolerates a wider fluctuation in core temperature before triggering a cooling response. As estrogen drops, that window shrinks, so even a small rise in body temperature, one that wouldn’t have registered before, sets off a full cascade: blood vessels in your skin dilate, skin temperature spikes across your face, chest, arms, and legs, and sweat production ramps up. One early measurement recorded whole-body sweat rates of about 1.3 grams per minute during a hot flash.
For hormonal night sweats, the environmental and dietary strategies above still help because they lower your baseline core temperature, making it less likely you’ll hit that narrower trigger zone. Smoking also worsens menopausal sweating, likely through its effects on estrogen metabolism and the thermogenic properties of nicotine. If you smoke, quitting may reduce both the frequency and severity of episodes.
Herbal supplements like black cohosh are widely marketed for hot flashes, but the clinical evidence is underwhelming. In a randomized trial published in the Journal of Clinical Oncology, both the black cohosh group and the placebo group saw about a 27% decline in hot flash frequency, with no significant difference between them. The one exception was that sweating specifically showed a modest improvement in the treatment group, but the overall picture suggests most of the benefit comes from the placebo effect.
Medications That Cause Night Sweats
Antidepressants are one of the most common medication-related causes of night sweats, and many people don’t connect the two. Excessive sweating occurs in roughly 10% of people taking SSRIs and 5 to 20% of those on SNRIs. The sweating often shows up within the first few weeks of starting the medication or after a dose increase.
Other medications known to cause night sweats include hormone therapies, certain blood pressure drugs, diabetes medications that can cause low blood sugar overnight, and fever reducers like acetaminophen or aspirin (which work by triggering sweating to lower temperature). If your night sweats started shortly after beginning or changing a medication, that timing is a strong clue. Your prescriber may be able to adjust the dose, switch to a different drug in the same class, or add something to counteract the sweating.
When Night Sweats Signal Something Serious
Most night sweats are annoying but harmless. The pattern that warrants medical attention is a specific cluster called “B symptoms,” used in diagnosing lymphomas and some other cancers. These are carefully defined: drenching sweats that soak through your bedclothes, unexplained fevers above 100.4°F, and unexplained weight loss of more than 10% of your body weight over six months. All three together raise a red flag. Night sweats alone, without the fever and weight loss, are far less concerning.
Infections, including tuberculosis and certain chronic infections, can also cause drenching night sweats. Hyperthyroidism, sleep apnea, and anxiety disorders are other medical causes worth considering if lifestyle changes don’t help and you can’t identify an obvious trigger. The distinguishing feature of medically significant night sweats is severity: waking up damp is common and usually benign, but regularly soaking through sheets and needing to change clothes overnight is worth investigating.