How to Stop Waking Up Sweaty at Night

You go to bed fine. Somewhere around 3am, you wake up. The sheets are damp. Your hair is stuck to your neck. You kick the doona off, flip your pillow to the cool side, and lie there wide awake wondering what just happened.

If this is you, you're not imagining it, and you're not alone. Waking up sweaty at night is one of the most common sleep complaints in Australia, and it has a real, fixable set of causes: what's happening in your body, what's happening in your room, and, more often than people expect, what's happening in your bed.

This guide walks through why it happens and the fixes that actually work, starting with the smallest habit changes and ending with the one change that tends to make the biggest difference: what's directly against your skin all night.

Why do I wake up sweating?

Your body temperature isn't flat overnight. It drops naturally as you fall asleep, moves through cycles across the night, and rises again before you wake. Sweating is simply your body's cooling system doing its job when it needs to shed heat. The problem isn't that you sweat. It's when that heat has nowhere to go.

A few things can tip the balance:

• Your sleep environment is trapping heat. Doonas, sheets and mattresses that hold body heat instead of releasing it create a warm microclimate around you, even in a cool room.
• Your body is running warmer than usual. Exercise late in the day, alcohol, spicy food, a heavier dinner, or a fever from being unwell can all push your core temperature up before bed.
• Hormonal changes. Shifts in oestrogen and progesterone (through perimenopause, menopause, your monthly cycle, or pregnancy) affect how your body regulates temperature, and can trigger sudden heat and sweating overnight. If this is you, you're not imagining it, and you're not alone. It's genuinely one of the most common reasons people land on this exact page.
• Medications. Some antidepressants, hormone therapies and other prescription medicines list night sweats as a known side effect.
• Other medical causes. Thyroid conditions, infections and a handful of other conditions can cause night sweats too.

Most of the time, waking up sweaty is a mix of the first two: an overheating environment plus something specific to that night (a big meal, a big workout, a warm room). For a lot of people, though, it's a near-nightly pattern, and that's usually where hormonal changes or bedding are the biggest levers.

A note on when to see a GP: if your night sweats are severe, happen most nights regardless of what you change, or come with other symptoms like unexplained weight loss, fever, or persistent fatigue, that's worth discussing with your doctor. This guide covers the sleep-environment side of things. It isn't a diagnosis, and it isn't a substitute for medical advice.

The fix list: from easiest to highest-leverage

Most advice on this topic starts and ends with "turn the air conditioning down." That's the least effective, most expensive fix available to you. Here's the fuller list, in the order most people should actually tackle it.

1. Habits: what you do before bed matters more than you'd think

• Move your workout earlier. Exercise raises core body temperature for hours afterwards. If you train in the evening, try to finish at least 2-3 hours before bed so your body has time to cool back down.
• Watch the nightcap. Alcohol widens blood vessels near the skin, which can trigger a heat-and-sweat response a few hours into sleep. It also disrupts the deeper sleep stages where temperature regulation is steadiest.
• Eat earlier, and lighter, at dinner. Digesting a large or spicy meal raises your metabolic rate right when your body is trying to wind down. A smaller dinner, eaten earlier, gives your temperature more room to drop before you get into bed.
• Have a lukewarm shower, not a hot one, before bed. Counterintuitively, a hot shower right before sleep can delay the drop in core temperature your body needs to fall asleep. Lukewarm works with your body's wind-down, not against it.
• Keep a glass of water by the bed. Being even mildly dehydrated makes your body worse at regulating heat.

2. Environment: set the room up, but don't overcorrect

This is the part most people get wrong. The instinct is to crank the air conditioning as low as it'll go. You don't need to freeze the room. Bedding does the cooling work; the room just needs to stay in a sensible, comfortable range, generally around 24°C is a reasonable, liveable target for most Australian bedrooms, not an icebox.

What actually helps in the room:

• Airflow over icebox temperatures. A fan moving air across the bed does more for comfort than a thermostat set to arctic. Moving air helps sweat evaporate, which is the actual cooling mechanism your body relies on.
• Block the heat before it gets in. Blockout curtains or blinds keep a room from heating up during the day, especially through summer, so you're not fighting yesterday's heat all night.
• Ditch the extra soft furnishings in warmer months. Heavy curtains, thick rugs and a pile of throw cushions all hold heat in a room. Swapping to lighter fabrics seasonally helps the room breathe.
• Turn off warm electronics near the bed. Chargers, laptops and older-style lamps all radiate small amounts of heat. It adds up more than people expect in a small bedroom.

None of this requires an 18°C bedroom and a jumper to survive it. Room temperature is one input. It's not the main lever.

3. The bedding layer: the highest-leverage fix, and the one people skip

Here's the part most "how to stop night sweats" advice leaves out entirely: what's actually touching your skin for eight hours matters more than almost anything else on this list, because it's in direct, sustained contact with your body all night, every night.

Most sheets, sold as "breathable" or "naturally cooling," are cotton, cotton blends, or bamboo. They feel fine in the shop. The problem shows up around 3am, when your body has generated heat all night and the fabric simply can't move it away fast enough. Cotton has a Qmax (a lab-measured cool-touch rating) of 0.11. That's the baseline every other fabric gets compared to.

This is where the actual physics matter. Rest's Evercool®+ fabric, used in our sheets and pillowcases, is SGS lab tested to a Qmax of 0.445 W/cm², measured to the JIS L 1927:2020 standard. In plain terms: it's over 4x cooler to the touch than cotton (Qmax 0.11). For context across the category: silk sits around 0.19, bamboo around 0.15, cotton at 0.11. Evercool is built to sit well above all three.

That number matters because it means the fabric is actively drawing heat away from your skin on contact, all night, rather than trapping it against you the way cotton does. Alongside cool-touch performance, Evercool®+ is engineered to wick moisture (tested to move it away from the skin fast, rather than letting it sit and soak in), so the fabric that's against you at 3am isn't the fabric holding the heat in in the first place. Sheets and pillowcases in this fabric are also woven with a silver yarn that gives the fabric ongoing freshness and odour resistance between washes, useful if you're someone who sweats through the night regularly.

None of this is about "cold" sheets. Cold-to-the-touch bedding that doesn't regulate is its own problem (ask anyone who's woken up freezing at 3am after their sheets overcorrected). The goal is bedding engineered to move heat and moisture away as your body produces it, so you land somewhere comfortable and stay there. You can read the full lab methodology on Qmax explained and the broader testing approach behind it on our science page.

If you've fixed your habits, sorted your room, and you're still waking up sweaty most nights, your bedding is very likely the missing piece. Try our sleep quiz for a two-minute read on what's actually driving your overheating and which fixes will move the needle fastest for you.

4. What to try first, realistically

If you only change one thing this week, change your sheets. It's the fastest fix to implement (no habit-forming required) and the one working while you sleep, every single night, without you having to remember to do anything. Everything else on this list compounds on top of that.

FAQ: waking up sweaty at night

Why do I suddenly wake up sweating in the middle of the night?
A sudden wake-up drenched in sweat, often around 3am, usually means your body has generated more heat than your environment or bedding can dissipate. Common triggers include a warm room, heat-trapping bedding, a big meal or workout earlier that evening, alcohol, or a hormonal shift. If it happens most nights without an obvious trigger, that's worth discussing with your GP.

Is waking up sweaty at night normal?
Occasional night sweats, especially after a hot day, a workout, or a big meal, are common and not usually a concern. If it's happening most nights, disrupting your sleep, or getting worse over time, it's worth looking at your sleep environment first (room, bedding) and speaking to your doctor if it persists.

Do cooling sheets actually stop night sweats?
Cooling sheets don't stop your body from producing sweat, that's a normal biological process. What they do is change what happens next: fabric with a higher Qmax (cool-touch rating) draws heat away from your skin instead of trapping it, and good wicking performance moves moisture away rather than letting it sit against you. Rest's Evercool®+ sheets are SGS lab tested at Qmax 0.445, over 4x cooler to the touch than cotton (0.11), which is the mechanism, not a guarantee, behind fewer damp, overheated wake-ups.

Should I turn my air conditioning down lower to stop sweating at night?
Not necessarily. You don't need to freeze the room to sleep cool. A steady, comfortable room temperature (around 24°C works for most people) combined with airflow from a fan does more for comfort than chasing a colder and colder thermostat setting. Overcooling a room also runs up energy costs for a smaller comfort gain than fixing what's actually on the bed.

Could my night sweats be hormonal?
They can be. Hormonal shifts during perimenopause, menopause, pregnancy, or across the monthly cycle are a well-documented cause of overheating and night sweats for a lot of people. If this is you, you're not imagining it, and you're not alone, it's one of the most common reasons people search for this exact fix. The habit, room, and bedding changes in this guide help regardless of the cause, because they address how your body sheds heat overnight. If your night sweats are new, severe, or come with other symptoms, that's a conversation worth having with your doctor.