Quick Answer: Stopping night sweats starts with your sleep environment -- keep your bedroom between 16 and 19 degrees Celsius, switch to breathable bedding, and replace heat-trapping foam mattresses with a breathable hybrid or latex model. For sweating with a medical cause, environment changes reduce severity while you address the root issue with your doctor.
In This Guide
Reading Time: 8 minutes
Step 1: Fix Your Bedroom Temperature
Your body's core temperature drops by roughly 1 to 2 degrees Celsius in the first hours of sleep. If the room is already warm, that natural drop is blunted, and the body compensates by sweating more. Research consistently identifies 16 to 19 degrees Celsius as the optimal sleep temperature range for most adults.
In practice, this means running air conditioning in summer, opening windows on cool nights, and using a programmable thermostat that drops the temperature automatically after your usual bedtime. A standing fan pointed away from the bed can improve air circulation without creating a direct cold draft that disturbs sleep.
Ontario winters are rarely the problem -- but Brantford summers and the tendency to over-heat bedrooms in the heating season can catch people off guard. Check your thermostat settings before blaming other causes.
Step 2: Upgrade Your Bedding
Bedding is the most immediate controllable variable after room temperature. The tog rating of your duvet -- its thermal resistance -- determines how much heat builds up against your body overnight. For most Canadian adults sleeping in a temperature-controlled bedroom, a duvet in the 4.5 to 9 tog range is appropriate for different seasons. A single 13.5-tog duvet year-round is a common cause of otherwise unexplained night sweats.
Best breathable bedding materials:
- Cotton percale -- lightweight, woven openly, low heat retention
- Bamboo viscose -- naturally moisture-wicking, soft, regulates temperature well
- Linen -- excellent airflow, becomes softer with washing, ideal for hot sleepers
- Lightweight wool -- wicks moisture, regulates temperature in both directions
Materials to avoid if you sweat:
- Polyester and microfibre -- trap moisture and heat against the skin
- Heavy flannel -- designed for warmth, counterproductive for hot sleepers
- Thick synthetic pillow fills -- pillows hold significant body heat around the neck and head
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Step 3: Evaluate Your Mattress
Your mattress is in contact with the largest surface area of your body for the entire night. Traditional dense memory foam is the most heat-retentive mattress type: the viscoelastic structure conforms tightly to the body, closing off natural air channels and creating a warm microclimate between you and the surface.
Alternatives that sleep cooler include:
- Innerspring and hybrid mattresses: The coil layer allows significant airflow through the core. Hybrids combine a coil base with a comfort layer of foam or latex, retaining airflow benefits while adding pressure relief.
- Natural latex: Open-cell structure allows more airflow than synthetic foam. Latex also has natural moisture-wicking properties and does not contour as closely as memory foam, which helps maintain air circulation.
- Open-cell or gel-infused foam: Better than traditional memory foam but still less breathable than coil or latex options. Phase-change material covers can help at the surface level.
If you sweat primarily from your back, hips, and shoulders -- the areas with the most mattress contact -- your mattress is likely a primary contributor. A mattress that sleeps cooler does not require you to change any other habits to see results.
Step 4: Change What You Wear to Bed
Tight-fitting synthetic sleepwear holds moisture against the skin and insulates the body at the garment level regardless of room temperature. Loose-fitting natural fibre clothing -- or none at all -- allows heat and moisture to escape freely.
Lightweight cotton or moisture-wicking merino wool are the most practical choices. If you prefer pyjamas, look for those labelled breathable or moisture-wicking. Avoid tight waistbands and long sleeves if you consistently wake from the upper body sweating.
Step 5: Lifestyle Adjustments
Several daily habits reliably raise core body temperature or activate the sympathetic nervous system in the hours before bed, both of which increase the likelihood of night sweats:
Alcohol: Even moderate alcohol consumption raises peripheral vasodilation and skin temperature. It also disrupts sleep architecture in the second half of the night, which is when hormonal fluctuations are most likely to trigger sweating. Avoiding alcohol within three hours of bedtime helps.
Spicy or heavy meals: Food digestion raises core temperature. Spicy food can also trigger facial and truncal flushing directly. Eating a lighter, earlier dinner reduces the thermal burden at sleep onset.
Evening exercise: High-intensity exercise raises core temperature for up to three hours. If your workouts are in the evening, finish at least two to three hours before bed or shift them to the morning.
Caffeine: Caffeine extends the thermogenic effect of stimulant activity. It also shortens slow-wave sleep, the phase during which thermoregulation is most efficient.
Stress and anxiety: Elevated cortisol maintains sympathetic nervous system activity into sleep, which keeps the body in a slightly elevated thermal state. Sleep hygiene practices -- consistent sleep times, a wind-down routine, limiting screens -- reduce cortisol at bedtime.
Step 6: Rule Out Medical Causes
If environmental and lifestyle changes do not produce a meaningful improvement within two to four weeks, a medical assessment is appropriate. Common treatable causes include medication side effects, thyroid dysfunction, sleep apnea, and hormonal changes associated with menopause or andropause.
See your doctor sooner if night sweats are accompanied by fever, unexplained weight loss, or other new symptoms. These combinations require investigation that lifestyle changes cannot address.
Brad, Owner, 40+ years of experience: "Step one is almost always the mattress and the bedding -- most people have never been told that a foam mattress acts like a thermal blanket underneath you. We start there, and for a lot of customers, that is enough."
Sweating through your sheets? Mattress Miracle at 441½ West Street in Brantford carries cooling mattresses, breathable protectors, and hybrid options that address night sweats from multiple angles. If your mattress traps heat, adjusting the thermostat only helps the room, not the surface you are lying on. Dorothy can build a complete sleep system that keeps you cooler from the mattress up. Call (519) 770-0001.
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Find Your Perfect Mattress at Mattress Miracle
We are a family-owned mattress store in Brantford, helping our community sleep better since 1997. Come try mattresses in person and get honest, no-pressure advice.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
How quickly will I notice improvement after changing my mattress?
Most people notice a difference within the first one to two weeks. The change is usually most apparent in the first half of the night, when you are spending the most time in direct contact with the mattress surface. Full adjustment to a new sleep surface typically takes about 30 days.
Will a mattress topper help if I cannot replace the whole mattress?
A breathable mattress topper -- natural latex or a wool topper -- can reduce heat retention at the surface. However, it does not address the heat stored in a dense foam core beneath. It is a partial solution, meaningful but less effective than replacing the mattress.
Is it safe to use a cooling fan blowing directly on me while I sleep?
A fan directed at the body can help with heat dissipation, but direct airflow can dry out the mouth and airways, and some people find it triggers congestion. Directing the fan to circulate room air rather than blow directly on the bed is a better approach for most people.
Can drinking cold water before bed stop night sweats?
Cold water before bed can slightly lower core temperature, which helps at sleep onset. However, drinking large volumes before bed increases the likelihood of waking to urinate, which disrupts sleep. A small glass of cool water is reasonable; more than that is counterproductive.
Sources
- Okamoto-Mizuno K, Mizuno K. Effects of thermal environment on sleep and circadian rhythm. J Physiol Anthropol. 2012;31:14.
- Mold JW, Mathew MK, Belgore S, DeHaven M. Prevalence of night sweats in primary care patients. J Am Board Fam Med. 2012;25(6):878-887. doi:10.3122/jabfm.2012.06.120075
- Freedman RR. Menopausal hot flashes: mechanisms, endocrinology, treatment. J Steroid Biochem Mol Biol. 2014;142:115-120.
- Stein PK, Pu Y. Heart rate variability, sleep and sleep disorders. Sleep Med Rev. 2012;16(1):47-66.
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle -- 441½ West Street, Brantford, ON -- (519) 770-0001
Hours: Monday-Wednesday 10am-6pm, Thursday-Friday 10am-7pm, Saturday 10am-5pm, Sunday 12pm-4pm.
Ready to stop waking up soaked? Come in and try our selection of breathable hybrid and latex mattresses -- we will help you find the right fit for your sleep style and budget.