Quick Answer: Night sweats in men are often caused by low testosterone, sleep apnea, alcohol use, or anxiety, but they can also signal infections or medication side effects. Drenching sweats that soak your sheets repeatedly warrant a visit to your doctor, especially if combined with fever, weight loss, or swollen glands. Environmental fixes help for mild cases.
In This Guide
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Waking up soaked in sweat is more common among men than many realize. While it can be easy to blame a warm bedroom or heavy blankets, genuine night sweats -- the kind that drench your clothes and sheets regardless of room temperature -- often have an underlying cause worth identifying. This guide walks through the most common reasons men experience night sweats, what the warning signs are, and practical steps you can take tonight.
Medical disclaimer: This article is for informational purposes only and does not substitute professional medical advice. If you are experiencing frequent, unexplained night sweats, consult your physician.
Why Men Get Night Sweats
Sweating during sleep is a normal part of how the body regulates temperature. The hypothalamus acts as the body's thermostat, triggering sweat when core temperature rises. During sleep, particularly in REM stages, this system can behave differently than when you are awake.
For men specifically, several physiological factors can tip the sweating system into overdrive at night:
- Hormonal shifts (testosterone decline)
- Airway obstruction during sleep (sleep apnea)
- Alcohol and stimulant use
- Anxiety and stress responses
- Prescription medications
- Underlying medical conditions
Sleep Science: The body's core temperature naturally drops during the first half of the night. Disruptions to this cycle -- from apnea events, hormonal changes, or fever -- can trigger sweat responses even when the room is cool.
Low Testosterone and Night Sweats
Testosterone levels begin declining gradually after age 30, with more noticeable drops after 40. While this is often discussed in terms of libido or muscle mass, low testosterone (hypogonadism) also affects the body's thermoregulatory system -- much the same way estrogen decline causes hot flashes in women.
Men with low testosterone may experience:
- Hot flashes during the day and sweats at night
- Fatigue and disrupted sleep
- Mood changes and irritability
- Reduced body hair and muscle tone
A simple blood test can measure total testosterone levels. If yours falls below the normal range (generally 300--1,000 ng/dL), your doctor can discuss options including lifestyle modifications or hormone therapy.
Sleep Apnea Connection
Obstructive sleep apnea (OSA) is a condition where the throat muscles relax during sleep, repeatedly blocking the airway. Men are two to three times more likely than women to have OSA. Each apnea event -- where breathing stops for seconds to a minute -- is a physical stressor that can trigger a surge of adrenaline, causing you to rouse and sweat.
Research published in Sleep Medicine found that men with untreated sleep apnea report night sweats at significantly higher rates than the general population. If your partner notices snoring, gasping, or long pauses in breathing, an overnight sleep study may be worth requesting from your GP.
Comfort Tip: If sleep apnea is suspected, sleeping on your side rather than your back can reduce airway obstruction temporarily while awaiting a diagnosis. A supportive mattress with good pressure relief at the shoulder makes side sleeping more comfortable.
Medications That Cause Sweating
A wide range of prescription drugs list night sweats as a side effect. Men commonly affected include those taking:
| Medication Type | Common Examples | Why It Causes Sweating |
|---|---|---|
| Antidepressants (SSRIs/SNRIs) | sertraline, venlafaxine | Affect serotonin pathways that regulate temperature |
| Antipyretics (taken regularly) | aspirin, acetaminophen | Rebound effect as drug wears off at night |
| Hormone therapy | testosterone replacement | Dose fluctuations affect thermoregulation |
| Opioids | codeine, oxycodone | Stimulate sweat glands via opioid receptors |
| Diabetes medications | insulin, metformin | Nocturnal hypoglycaemia triggers cold sweats |
Never stop a prescribed medication without speaking to your doctor, but do mention night sweats at your next appointment. A dosage adjustment or switch to an alternative drug can often resolve the problem.
Normal vs. Concerning Night Sweats
Not all nighttime sweating is a red flag. If your bedroom is warm, you piled on too many blankets, or you had alcohol before bed, waking up damp is unremarkable. Concerning night sweats are typically defined by clinicians as sweating that is severe enough to soak through your pyjamas and bedding, occurring on multiple nights without an obvious environmental cause.
The following combination of symptoms alongside night sweats warrants prompt medical attention:
- Unexplained weight loss
- Swollen lymph nodes in the neck, armpits, or groin
- Persistent fever
- Fatigue that does not improve with rest
- Coughing up blood
These symptoms together can indicate serious conditions including lymphoma, tuberculosis, or HIV -- all of which have night sweats as a documented symptom. Early diagnosis leads to significantly better outcomes.
From Our Team: "We see a lot of men come in for a new mattress because they think their bed is causing them to overheat -- and sometimes that is part of it," says Dorothy, our sleep specialist. "But if you are soaking through your sheets, talk to your doctor first. The right mattress can help, but it is not the cure for a medical issue."
Bedding and Mattress Solutions
Even when you are working with a healthcare provider on the underlying cause, the right sleep environment can make nights significantly more bearable. Men who sweat at night benefit most from:
- Breathable mattress covers: A moisture-wicking, waterproof protector draws sweat away from the surface and prevents it from soaking into the mattress itself. This also extends the life of your mattress significantly.
- Innerspring or hybrid mattresses: Dense memory foam traps heat because it conforms closely around the body. Mattresses with individually wrapped coils -- like the Restonic ComfortCare series we carry -- allow air to circulate through the sleep surface, reducing heat build-up.
- Natural fibre sheets: Percale cotton or linen sheets wick moisture and breathe far better than synthetic blends. Thread counts between 200 and 400 generally outperform higher-count sheets for breathability.
- Adjustable room temperature: Most sleep researchers suggest 16--19 degrees Celsius as the optimal bedroom temperature for uninterrupted sleep.
Brantford Tip: Southwestern Ontario winters can push people to overheat their bedrooms. If you are waking up sweating between November and March, turning your thermostat down a few degrees before bed is a free first step worth trying before looking at mattress upgrades.
When to See a Doctor
See your family doctor if night sweats:
- Occur three or more nights per week
- Are accompanied by any of the red-flag symptoms listed above
- Have been going on for more than two weeks without a clear cause
- Are significantly disrupting your sleep or affecting your daytime function
Your doctor will likely order blood work including hormone panels, a complete blood count, and possibly thyroid function tests. A referral for a sleep study may follow if apnea is suspected.
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Call 519-770-0001Frequently Asked Questions
Can low testosterone cause night sweats in men?
Yes. Low testosterone affects the hypothalamus, the part of the brain that regulates body temperature. Men with hypogonadism can experience hot flashes and night sweats similar to those seen in women during menopause. A blood test measuring total testosterone can confirm whether low T is a factor.
Does alcohol cause night sweats in men?
Alcohol causes blood vessels to dilate, which increases surface heat loss and can trigger sweating. As the body metabolizes alcohol through the night, it can also trigger rebound arousal and sweating. Even a moderate amount of alcohol in the evening can worsen nighttime sweating.
Is it normal for men to have night sweats in their 40s?
It is more common than many men realize, often linked to gradual testosterone decline, increased stress, or the development of sleep apnea -- all of which become more prevalent in middle age. However, "common" does not mean it should be ignored. Persistent night sweats deserve investigation.
Can anxiety cause night sweats in men?
Absolutely. Anxiety activates the sympathetic nervous system (fight-or-flight response), which raises heart rate, blood pressure, and core temperature. This can trigger sweating during the night, especially if anxiety-related thoughts intrude during lighter sleep stages.
What type of mattress is best for men who sweat at night?
Innerspring and hybrid mattresses generally sleep cooler than all-foam models because the coil layer allows air to circulate. A breathable mattress protector adds moisture management. Avoid thick memory foam toppers if heat is a problem, as these significantly reduce airflow.
Sources
- Mold, J.W., Mathew, M.K., Belgore, S., & DeHaven, M. (2002). Prevalence of night sweats in primary care patients. Journal of Family Practice, 51(5), 452--456.
- Mold, J.W., & Roberts, M. (2013). Night sweats in primary care: a systematic review. JABFM, 26(5), 623--631.
- Grunstein, R.R., et al. (2004). Night sweats and sleep disordered breathing in men. Sleep Medicine, 5(4), 363--368.
- Bhasin, S., et al. (2018). Testosterone therapy in men with hypogonadism: an Endocrine Society clinical practice guideline. Journal of Clinical Endocrinology & Metabolism, 103(5), 1715--1744.
- Viera, A.J., Bond, M.M., & Yates, S.W. (2003). Diagnosing night sweats. American Family Physician, 67(5), 1019--1024.
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