How to Stay Cool While Sleeping: 12 Solutions Ranked

Somewhere around 2 a.m., you are lying on top of the covers with one leg hanging off the bed, and you have already flipped the pillow twice. Sound familiar? Sleeping hot is one of the most common sleep complaints, and it is also one of the most fixable. The solutions range from things you can do tonight for free to investments that pay off every night for years.

This is the full toolkit, ranked from cheapest to most impactful. Start at the top, work your way down, and stop when you are sleeping through the night.

Free: Tonight

1. Lower the Thermostat

Set your bedroom to 17-18°C (63-65°F). Most homes run at 21°C for daytime comfort, which is 2-4 degrees too warm for optimal sleep. Your body needs to drop its core temperature by about 1°C to initiate sleep, and a warm room prevents this. If you share a home with someone who prefers warmth, close the bedroom door and lower just that room if possible.

2. Open a Window (When Possible)

Fresh air circulation removes trapped heat and brings in cooler outside air. Even a few centimetres of opening makes a difference. In Ontario, spring and fall nights are often ideal for open-window sleeping, typically 10-15°C. In winter, this is impractical, but summer evenings after 10 p.m. often drop below 20°C.

3. Sleep With Less

Remove one layer from your current setup. If you use a duvet and a sheet, try just the sheet. If you use a heavy duvet, switch to a lighter one. You can always pull a blanket up at 4 a.m. if you get cold, but starting with less prevents the 2 a.m. overheat that wakes you up.

4. Take a Warm Shower Before Bed

This sounds backwards, but a warm shower 60-90 minutes before bed raises your skin temperature, which triggers vasodilation. Your blood vessels open up and dump core heat rapidly after you step out. The net effect is a lower core temperature at bedtime. Research from the University of Texas found this can reduce sleep onset time by about 10 minutes.

Low Cost: This Week

5. Switch to Cotton or Linen Sheets

Synthetic sheets (polyester, microfibre) do not absorb moisture. When you sweat, the moisture sits on your skin. Cotton percale sheets (200-400 thread count) absorb moisture and allow it to evaporate. Linen is even more breathable and gets softer with each wash. Either option costs $50-150 and makes a noticeable difference from the first night.

6. Add a Fan

Even gentle air movement across the bed surface accelerates evaporative cooling. A fan does not lower the room temperature, but it moves air across your skin, which helps sweat evaporate and removes trapped heat from the microclimate around your body. Point it at the wall or ceiling rather than directly at your face to avoid drying out your sinuses.

7. Wear Light, Moisture-Wicking Sleepwear

Counterintuitively, thin moisture-wicking sleepwear can keep you cooler than sleeping naked. The fabric draws sweat away from the skin surface, creating a thin layer where evaporative cooling can happen efficiently. Cotton is fine. Bamboo-derived fabrics work well too. Avoid flannel and heavy cotton.

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Moderate Cost: This Month

8. Get a Lighter Duvet

Duvets are rated in tog (a measure of thermal resistance). Summer duvets are 3-4.5 tog. All-season duvets are 10-13.5 tog. If you are sleeping with a heavy all-season duvet year-round, switching to a lighter option for spring through fall eliminates one of the biggest heat traps on your bed. Some companies sell dual-season duvets with poppers that let you use a light layer or clip two together for winter.

9. Use a Cooling Pillow

Gel, shredded latex, or buckwheat pillows retain less heat than solid foam or polyester-filled pillows. They will not solve a whole-body overheating problem, but they keep your head and neck cooler, which is disproportionately important for comfort. Your head dissipates a significant percentage of body heat, so a cooler pillow helps the whole system.

10. Try a Cooling Mattress Pad

Gel-infused or phase-change mattress pads sit on top of your existing mattress and provide a cooler sleeping surface. They are a reasonable solution if your mattress is otherwise in good condition but sleeps warm. Effectiveness varies by product. Active cooling pads (with water circulation) work better than passive gel pads but cost more and require maintenance. See our cooling pad guide for detailed comparisons.

Investment: This Year

11. Replace a Heat-Trapping Mattress

If you have worked through the list above and still sleep hot, the mattress is the remaining variable. Dense foam mattresses absorb body heat with no mechanism to vent it. Pocket coil mattresses create airflow channels through the coil structure that continuously dissipate heat.

At Mattress Miracle, the ComfortCare Dalton at $1,079 is the entry point for hot sleepers. The 690 individually wrapped pocket coils create an air-permeable structure, and gel-infused foam comfort layers conduct heat away from the body faster than standard foam. For people who run very warm, the Stratton at $1,595 adds a phase-change fabric cover that actively absorbs excess body heat.

A mattress is a 10-year investment. Divide the cost by 3,650 nights and the per-night cost of sleeping cool is under 50 cents.

12. Add or Upgrade Air Conditioning

If your bedroom consistently exceeds 22°C in summer and you do not have air conditioning, a window or portable unit for the bedroom may be worth the investment. The energy cost of running AC to maintain 18°C in one room overnight is typically $1-2 per night. Combined with a breathable mattress and lightweight bedding, air conditioning makes even the hottest Ontario summers manageable for sleep.