Night sweats in men are surprisingly common, and most of the time the cause is something manageable, not something dangerous. The reasons range from simple bedroom overheating to hormonal shifts, medications, sleep disorders, stress, and alcohol use. Less often, persistent drenching sweats can signal an underlying medical condition that needs attention.
The key distinction is between waking up a little warm and experiencing true night sweats, where clothing and sheets are soaked through and need to be changed. Occasional mild sweating on a hot night is normal physiology. Repeated, drenching episodes that happen regardless of room temperature are worth investigating.
Low Testosterone and Hormonal Shifts
Men experience a gradual decline in testosterone starting around age 30, and for some, this drop becomes significant enough to cause symptoms, sometimes called andropause or “male menopause.” One of the hallmark symptoms is night sweats and hot flashes, which work the same way they do in women going through menopause. The brain’s temperature control center, the hypothalamus, becomes more sensitive when sex hormone levels fall. It misreads normal body temperature as too high and triggers a cooling response: blood vessels in the skin suddenly widen, causing a flush of warmth, followed quickly by a cold, clammy sweat.
If your husband is over 40 and the night sweats come with fatigue, reduced sex drive, or mood changes, declining testosterone is a likely contributor. A simple blood test can confirm whether levels are low.
Sleep Apnea Is a Hidden Culprit
Obstructive sleep apnea, where the airway repeatedly collapses during sleep, is one of the most overlooked causes of night sweats in men. About 31% of people with sleep apnea report frequent night sweats (three or more times per week), compared to roughly 11% of the general population. The repeated drops in oxygen and surges in stress hormones each time breathing stops keep the nervous system in a state of arousal, raising heart rate and body temperature throughout the night.
The good news: treating sleep apnea with a CPAP machine cuts the rate of frequent night sweats from about 33% down to 12%, nearly matching the general population. If your husband also snores heavily, gasps during sleep, or feels exhausted despite a full night’s rest, sleep apnea is worth ruling out.
Medications That Cause Sweating
Several common medications list increased sweating as a side effect, and night is often when people notice it most. The biggest offenders include:
- Antidepressants: SSRIs and SNRIs (commonly prescribed for depression and anxiety) are well-known for causing excessive sweating.
- Diabetes medications: Insulin and oral blood sugar-lowering drugs can cause nighttime drops in blood sugar, which triggers sweating as the body tries to correct the imbalance.
- Thyroid medications: Too high a dose of thyroid replacement hormone can push the body into an overactive state, producing excess heat and sweat.
- Anti-seizure medications: Certain types are associated with increased sweating.
If the sweating started around the same time as a new prescription or a dosage change, that connection is worth raising with a doctor. Adjusting the dose or switching medications often resolves the problem.
Alcohol and Evening Habits
Alcohol has a counterintuitive effect on body temperature. During the day it can actually lower core temperature slightly, but at night it raises it. Even moderate drinking in the evening increases heart rate throughout the sleep period and disrupts the body’s normal temperature dip that happens during deep sleep. The result is a warmer body that sweats more, especially in the second half of the night as the body metabolizes the alcohol.
Binge drinking amplifies this effect significantly, with heart rate remaining elevated well into the later hours of sleep. If your husband has a few drinks most evenings and sweats heavily in the early morning hours, alcohol is a very likely factor. Cutting back or stopping drinking for a couple of weeks is one of the simplest ways to test whether this is the cause.
Spicy foods, caffeine, and heavy meals close to bedtime can also raise core temperature and contribute to sweating, though these are generally less dramatic triggers than alcohol.
Stress and Anxiety
Chronic stress doesn’t clock out when your husband falls asleep. The body’s fight-or-flight system, when activated by ongoing worry, financial pressure, or work stress, increases heart rate and narrows blood vessels. That generates extra heat, which the body then tries to shed through sweating. This happens around the clock, but people often only notice it at night because they’re lying still in a quiet room with nothing else going on.
Stress-related night sweats tend to come alongside other signs: difficulty falling asleep, waking with a racing mind, jaw clenching, or muscle tension. Addressing the underlying anxiety, whether through exercise, therapy, or lifestyle changes, typically improves the sweating as well.
Less Common but Serious Causes
In a small percentage of cases, persistent night sweats point to something more significant. Infections like tuberculosis and endocarditis (an infection of the heart valves) are classic causes. An overactive thyroid gland ramps up metabolism and heat production. Certain cancers, particularly lymphoma and leukemia, can cause drenching night sweats as an early symptom.
The important thing to know is that serious causes almost never show up as night sweats alone. Red flags that warrant prompt medical evaluation include:
- Unexplained weight loss of more than 5% of body weight over 6 to 12 months
- Persistent or recurring fevers
- Swollen lymph nodes that last longer than 4 to 6 weeks
- Easy bruising or unusual bleeding
- Persistent fatigue that doesn’t improve with rest
If none of those red flags are present, the odds are strongly in favor of a benign and fixable cause.
Practical Ways to Reduce Night Sweats
While figuring out the underlying cause, there are several changes that can make nights more comfortable. Bedroom temperature between 60 and 67°F (15 to 19°C) is the generally recommended range for sleep. A fan or air conditioning helps, but what your husband sleeps on and in matters just as much.
Traditional memory foam traps body heat. If that’s what you’re sleeping on, consider switching to natural latex, which has an open-cell structure that circulates air, or a gel-infused memory foam that absorbs and disperses heat more effectively. Hybrid mattresses with a coil base and foam comfort layers offer good ventilation from the airflow between the coils. Some mattresses and toppers now include phase change materials that actively absorb heat when the body warms up and release it as the body cools down.
For sheets and sleepwear, moisture-wicking fabrics make a noticeable difference. Bamboo blends, Tencel, and performance synthetics designed to pull moisture away from the skin dry faster than cotton and keep the surface feeling cooler. Sleeping in lightweight, loose-fitting clothes (or none at all) also helps the body regulate temperature more efficiently.
Beyond the sleep environment, limiting alcohol in the 3 to 4 hours before bed, keeping evening meals lighter, and managing stress through regular exercise all reduce the frequency and severity of night sweats for many men.