Night sweats happen when your brain’s internal thermostat, the hypothalamus, triggers a sudden wave of blood vessel dilation and sweating while you sleep. Stopping them depends on what’s causing them, but a combination of sleep environment changes, lifestyle adjustments, and sometimes medication can reduce or eliminate episodes for most people. Here’s how to approach it systematically.
Why Night Sweats Happen
Your hypothalamus constantly monitors your core body temperature and makes automatic adjustments through your nervous system. When something disrupts this process, whether it’s a hormone shift, a medication, low blood sugar, or even a too-warm bedroom, the hypothalamus can overreact. It rapidly dilates blood vessels near the skin in what’s called a vasomotor spasm, flooding the surface with heat and triggering a burst of sweating to cool you down. The result is waking up drenched, sometimes enough to soak through your sheets.
The key to stopping night sweats is figuring out which trigger is narrowing your body’s comfort zone so tightly that normal sleep temperatures set off this alarm. For some people, the fix is straightforward. For others, it takes a bit of detective work.
Cool Your Sleep Environment First
Regardless of the underlying cause, a cooler bedroom reduces the frequency and severity of night sweats. The Cleveland Clinic recommends keeping your bedroom between 60 and 67°F (15 to 19°C). If your room is warmer than that, your body has less margin before it trips into a sweating episode.
Beyond air temperature, your bedding matters. Bamboo fabric has a naturally porous fiber structure that lets air circulate and releases moisture quickly, keeping your sleep surface dry. Linen absorbs moisture well but holds onto it longer, which can leave the fabric feeling damp and heavy in sustained heat. Cotton is a reasonable middle ground, but if you’re sweating heavily, bamboo sheets and sleepwear tend to outperform both cotton and linen at managing moisture overnight. Bamboo also adapts to temperature fluctuations, releasing excess warmth when you’re hot and retaining light insulation when temperatures drop.
A few other environmental fixes that help: sleep with lighter blankets you can kick off easily, use a fan for airflow even if you have air conditioning, and avoid memory foam pillows or mattress toppers that trap heat against your body.
Alcohol, Food, and Evening Habits
Alcohol is one of the most common and most overlooked triggers for night sweats. It causes blood vessels to dilate, which raises skin temperature and prompts sweating. People who drink regularly may experience night sweats several hours after their last drink, and for heavy drinkers, sweating can persist for days as the body processes the alcohol. There’s no fixed timeline for how long alcohol-related sweating lasts because it depends on how much you drank, how fast your body metabolizes it, and your overall health. But if you’re having night sweats and drinking in the evening, cutting out alcohol for a couple of weeks is one of the fastest ways to test whether it’s a factor.
Spicy foods and large meals close to bedtime also raise core body temperature during digestion. Eating your last meal at least two to three hours before sleep gives your body time to cool down. Caffeine in the afternoon or evening can have a similar effect by stimulating your nervous system and keeping your metabolic rate elevated.
Exercise is worth mentioning here too. Regular physical activity improves temperature regulation over time, but exercising within two to three hours of bedtime temporarily raises your core temperature and can trigger sweating during the night.
Hormonal Night Sweats
Menopause is the single most common cause of persistent night sweats. Fluctuating estrogen levels disrupt the hypothalamus, narrowing the range of temperatures your body considers “normal.” Small, routine increases in core temperature during sleep are enough to trigger full vasomotor episodes: flushing, rapid sweating, and then chills as the sweat evaporates.
Hormone replacement therapy remains the most effective treatment for menopausal night sweats, but it’s not suitable for everyone. For those who can’t or prefer not to use hormones, several non-hormonal options exist. A newer prescription medication (fezolinetant, sold as Veozah) targets the brain pathway involved in hot flashes directly and is taken as a single daily tablet. Gabapentin, typically taken at bedtime in doses starting around 300 mg and working up to 900 mg, has solid evidence for reducing vasomotor symptoms and has the added benefit of promoting sleep. Nighttime-only dosing minimizes daytime drowsiness, which is its most common side effect.
Medication-Related Sweating
Antidepressants, particularly SSRIs and SNRIs, are a frequent culprit behind unexplained night sweats. If your sweating started or worsened after beginning a new medication, that’s a strong clue. The general approach to antidepressant-induced sweating involves three options: lowering the dose, switching to a different medication, or adding a second medication that targets the sweating directly.
Several add-on medications have been studied for this purpose, though the evidence base is still relatively small. The most studied option is an alpha-blocker (terazosin), which was evaluated in 93 patients and typically used at a dose taken at bedtime. An anticholinergic medication (oxybutynin) showed benefit in a controlled trial of 66 patients. Both work by dampening the nerve signals that drive sweating. Your prescriber can help decide whether adjusting your current medication or adding something new makes the most sense for your situation.
Blood Sugar Drops During Sleep
If you have diabetes, particularly if you use insulin, nocturnal hypoglycemia is a possible cause of night sweats. When blood sugar falls below 70 mg/dL during sleep, the body releases stress hormones that trigger sweating, shakiness, and a rapid heartbeat. You may wake up drenched without realizing your blood sugar dropped.
Several patterns increase the risk: skipping dinner, exercising before bed, drinking alcohol in the evening, or having an active infection. Prevention strategies include adjusting the timing or dose of insulin with your doctor’s guidance, setting an early-morning alarm to check blood sugar and identify patterns, or using a continuous glucose monitor with a low-glucose alarm that wakes you before levels drop too far. If you’re waking with night sweats and have diabetes, checking your blood sugar during an episode can quickly confirm or rule out this cause.
Red Flags Worth Investigating
Most night sweats have a benign explanation, but certain patterns warrant a closer look. Drenching night sweats, the kind that soak through your clothes and sheets, combined with unexplained weight loss, persistent fevers, swollen lymph nodes (especially in the neck, armpit, or groin), persistent fatigue, or bone pain can be associated with lymphoma and other serious conditions. These are known as “B symptoms” in the context of blood cancers.
Having one or two of these symptoms doesn’t mean you have lymphoma. But recurring, drenching sweats that don’t respond to the environmental and lifestyle changes above, especially when paired with any of those other signs, are worth bringing up with your doctor. A physical exam, blood work, and sometimes imaging can usually provide answers quickly.