Night sweating usually comes down to your body struggling to shed heat efficiently, whether because your bedroom is too warm, your bedding traps moisture, or something internal is pushing your thermostat off balance. The good news: most causes are fixable with straightforward changes to your sleep environment, pre-bed routine, and bedding choices.
Your core body temperature naturally drops before and during sleep. That decline is what signals your brain it’s time to fall asleep, and it continues until it hits its lowest point in the middle of the night. Anything that interferes with this cooling process, from a hot room to heavy blankets to hormonal shifts, can trigger excess sweating.
Keep Your Bedroom Between 60 and 67°F
The single most effective change is lowering your room temperature. Cleveland Clinic recommends keeping your bedroom between 60 and 67°F (15 to 19°C) for adults. Think of your bedroom as a cave: cool, dark, and quiet. If you don’t have air conditioning, a fan pointed toward your bed helps move air across your skin, which speeds evaporation and cooling. Even a small temperature reduction, from 72°F down to 67°F, can make a noticeable difference in how much you sweat.
Humidity matters too. Warm, humid air makes it harder for sweat to evaporate, so your body produces more of it trying to cool down. If you live in a humid climate, a dehumidifier in the bedroom can help your sweat do its job more efficiently.
Choose Bedding That Breathes
Your sheets and blankets create a microclimate around your body all night. The wrong materials trap heat and moisture against your skin, which is often the real culprit behind waking up drenched.
For sheets, linen is the most breathable option. Cotton percale in a 200 to 300 thread count range is a close second. Both allow air to circulate and wick moisture away from your skin. Tencel (lyocell) sheets feel cool to the touch and wick moisture well, making them another strong choice if you run hot. Skip sateen weaves, microfiber, and high thread count cotton. These fabrics feel silky but trap heat.
For blankets and duvets, wool is surprisingly effective. It absorbs sweat vapor and releases it gradually, so you stay warm without that sticky, overheated feeling. A lighter-weight duvet or layered blankets give you the option to shed a layer if you start warming up, which is much easier than fighting a single heavy comforter all night.
Use a Warm Shower to Trigger Cooling
This sounds counterintuitive, but a warm shower one to two hours before bed actually helps your body cool down faster. A meta-analysis of existing research found that water temperature between 104 and 109°F (40 to 42.5°C) for as little as 10 minutes improved sleep quality and shortened the time it took to fall asleep. The mechanism is simple: warm water dilates blood vessels in your hands and feet, which pulls heat from your core to your extremities, where it radiates away. By the time you get into bed, your core temperature is dropping faster than it would have otherwise.
Timing matters. If you shower right before bed, you’ll still feel warm when you lie down. That one-to-two-hour window gives your body enough time to complete the heat dissipation process.
Consider What You Eat, Drink, and Wear
Alcohol is one of the most common triggers for night sweats. It dilates blood vessels and disrupts your body’s temperature regulation for hours after your last drink. Spicy food and caffeine close to bedtime can have similar effects, raising your core temperature right when it should be falling.
What you wear to bed also plays a role. Loose, lightweight sleepwear in cotton or moisture-wicking fabric lets heat escape. Tight or synthetic clothing holds warmth against your skin. Some people sleep cooler with no clothing at all, since there’s nothing between their skin and the air to trap heat.
Exercise raises your core temperature for several hours afterward. If you work out in the evening, try to finish at least two to three hours before bed so your body has time to cool back down.
Cooling Technology That Actually Works
If environmental changes aren’t enough, sleep cooling products fall into two categories with very different results.
Passive cooling products, like gel-infused foam toppers and phase-change material pads, absorb your body heat when you first lie down. They feel cool initially, but phase-change materials typically lose their cooling effect after 45 to 90 minutes as they reach your body temperature. Standard gel-infused foam fades even faster. These products help with falling asleep but won’t keep you cool all night.
Active cooling systems circulate temperature-controlled water or air through a pad on your mattress. Products like the ChiliPad or similar systems continuously pull heat away from your body throughout the night rather than just absorbing it temporarily. They cost more, but they’re the only bedding technology that actually lowers your body temperature rather than slowing heat buildup. If you’re a serious night sweater, this is the category worth investing in.
Hormonal and Medical Causes
For people going through menopause, night sweats have a specific biological cause. Declining estrogen levels narrow what’s called the thermoneutral zone, the range of core body temperatures your brain considers “normal.” In premenopausal women, this zone is wide enough that small temperature fluctuations don’t trigger a response. After estrogen drops, even a tiny rise in core temperature can set off a full heat-dissipation response: flushing, sweating, and that wave of intense internal heat. Elevated levels of norepinephrine, a stress-related chemical in the brain, contribute to this narrowing. Estrogen therapy has been shown to raise the sweating threshold, which is why it reduces hot flash frequency.
Certain medications are also known to cause excessive sweating as a side effect. SSRIs (common antidepressants like sertraline and fluoxetine), tricyclic antidepressants, and opioid pain medications all interfere with thermoregulation and can trigger night sweats. If your sweating started or worsened after beginning a new medication, that connection is worth discussing with your prescriber. Adjusting the dose or switching medications often resolves it.
When Night Sweats Signal Something Else
Most night sweating is environmental or hormonal and responds to the changes above. But certain patterns warrant medical attention. Night sweats combined with unexplained weight loss, persistent fever, easy bruising or bleeding, or swollen lymph nodes can point to underlying conditions that need evaluation. The same is true for drenching sweats that soak through your sheets regularly regardless of room temperature or bedding, particularly if they’re new and you can’t connect them to any obvious cause like menopause, medication, or a warm room.