In This Article:
Why Do I Get Hot at Night?
What to Look for in a Cooling Mattress
What Type of Mattress is Best for Hot Sleepers?
Additional Tips for Shopping Cooling Mattresses
When you crawl into bed after a long day, you want to feel comfortable and cozy—but not hot. You also want to wake up feeling refreshed, not stuck to your bedsheets and swimming in your own sweat.
Thankfully, your temperature naturally drops when you sleep, and excess heat leaves the body. However, with the wrong mattress and bedding, that heat has nowhere to go. Instead of dispersing into the air around you, it gets trapped beneath the covers and within your mattress, making you even hotter and sweatier.
To counteract this natural occurrence, you need a bed and bedding designed to dispel heat and moisture, leaving you cool and dry so you can fall asleep comfortably. In this guide, we'll discuss what a cooling mattress is and how to find one that suits all your sleep needs. If you want to learn about bedding that's breathable and moisture-wicking, check out our guide to the Best Cooling Sheets for Hot Sleepers.
Before you head to a mattress store or start browsing online for a cooling mattress, you should try to identify why you tend to sleep hot. The problem could be your mattress and bedding, but it could also be a sign of a health condition that needs your attention. In the case of the latter, buying a cooling mattress can provide some relief, but you'll still need to treat the underlying condition to get more comfortable sleep.
As mentioned above, the human body naturally drops in temperature during sleep. It may sound counterintuitive, but this temperature drop is actually what causes a lot of people to "sleep hot." If your mattress and bed sheets trap the excess heat, it creates a humid environment under the covers. This causes the body to sweat to try and cool itself down, which creates even more heat and moisture, creating a cycle of discomfort.
Night sweats and sleeping hot can also be side effects of a medication, sleep apnea, infection or illness, various medical conditions, and hormonal changes during pre-menstruation, pregnancy, and menopause. If you suspect a health condition is the cause of your discomfort, talk to your doctor about identifying and treating the root cause.
Aside from bodily causes, you may sleep hot and sweat at night because of your environment. Research suggests that 65 degrees Fahrenheit is the ideal room temperature for sleep, give or take a few degrees. If you sleep with the thermostat set higher than that, your body has to work harder to stay cool as you sleep.
Lastly, the materials you surround yourself with while you sleep can trap heat if they don't have a breathable design. Your sleepwear, bedding, and mattress should all work with your body's natural cooling process, not against it by locking in warmth and moisture.
With an understanding of what natural processes and environmental conditions make you sleep hot and sweat, you can identify the characteristics that all the best cooling mattresses have in common.
Most importantly, a cooling mattress must use temperature-neutral materials that dissipate heat and must be breathable to allow for air circulation. We'll explore these properties further as we discuss the most common mattress materials and how they stack up in terms of cooling capabilities.
When shopping for a cooling mattress, it helps to choose which type of mattress you want first and then compare brands and models within that category. Let's go over the four main mattress types: innerspring, foam, latex, and hybrids.
Traditional innerspring mattresses can't compete with foam and latex models in the pressure relief and contouring departments. But when it comes to cooling, they can do a decent job—depending on the construction.
Innerspring mattresses built with individually-wrapped coils allow for ample airflow. The space in between the springs allows for free circulation, keeping the support layer of the mattress cool and preventing humidity build-up.
However, coil mattresses use a wide range of materials for their top layer. If the comfort layer—the part of the mattress that comes in closest contact with the body—isn't made with breathable or temperature-neutral materials, it will trap heat.
If you do opt for an innerspring mattress, make sure all of the fabrics and fillings used on top are breathable and don't retain moisture. Hot sleepers will want to steer clear of mattresses with polyester fabrics, fiberfill, or memory foam padding in the comfort layer.
Because many mattress companies have their own foam formulas, foam mattresses run the gamut in terms of cooling capabilities. While some foams are airy and completely temperature neutral, others are packed tight or include harsh chemicals that trap heat within the foam.
Fortunately, there's a simple way to identify a foam mattress's temperature properties. Many foam mattresses use viscoelastic polyurethane—also known as memory foam—and thus have common characteristics.
While memory foam mattresses have their advantages, they're infamous for trapping body heat and further agitating hot sleepers.
Unlike other mattress foams, viscoelastic polyurethane (memory foam) uses both pressure and heat to contour to your body's curves. In other words, the material is temperature sensitive—it requires heat to cushion your bones and joints and maintain its "memory." In order to achieve memory foam's signature viscosity and density, manufacturers must use chemical additives. These chemicals store heat within the mattress and may also cause off-gassing.
Due to memory foam's heat sensitivity, its firmness also fluctuates with the temperature. In cold environments, memory foam remains stiff and firm. When surrounded by hot air, memory foam becomes more supple. As a result, memory foam mattresses can feel too hard in winter and too soft in summer. If you live in a climate with all four seasons, you'll notice these shifts throughout the year, making it difficult to get consistent, comfortable sleep.
In an attempt to offset memory foam's heat-trapping qualities, many companies infuse the foam with active cooling agents like charcoal, copper, or gel.
Coolant-infused memory foam mattresses may sleep cooler than standard memory foam models, but they also cost more. Essentially, you'll pay a premium for an additive that tries to "cancel out" memory foam's heat-storing nature. Alternatively, you could buy a more affordable temperature-neutral foam mattress that sleeps cool to begin with.
AirFoam™, Nolah's proprietary foam blend, is an example of a breathable and temperature-neutral foam formula. Three of our mattresses feature this cooling relief foam, including the Nolah Original which U.S. News named the Best Cooling Mattress of 2021.
Unlike memory foam, AirFoam™ contours with pressure alone, not heat. Moreover, it doesn't contain the harsh chemicals that give viscoelastic polyurethane its malleability. As a result, Nolah AirFoam™ dissipates heat 20 percent faster than high-end memory foam.
Thanks to its temperature neutrality, AirFoam™ offers gentle contouring, not the dramatic conforming that makes sleepers feel "stuck" in heat-sensitive memory foam. It also remains consistently firm year-round, regardless of seasonal temperature fluctuations.
Hot sleepers considering a latex mattress should know that synthetic latex and natural latex have very different properties when it comes to temperature control. While naturally-sourced latex is temperature neutral and sleeps cool, synthetic latex often contains temperature-sensitive fillers that store heat.
That said, natural latex is a solid option for hot sleepers. Natural latex feels flexible and bouncy, offering gentle contouring without heat-trapping chemical additives. To produce latex mattresses, manufacturers start by whipping the sappy latex liquid into a frothy foam. This process makes the foam highly breathable, which keeps latex mattresses well ventilated.
While browsing your options, you'll see some latex beds made with Talalay latex and others with Dunlop latex, the two types of all-natural latex. In general, Talalay offers better breathability than Dunlop because of its lower density. If you want to learn about latex types, head over to our Latex Mattress Shopping Guide. As shown below, some latex mattresses also use perforated foam, which further improves air circulation.
Hybrid mattresses combine an innerspring base with one or more layers of foam or latex. As with stand-alone innerspring mattresses, the open construction of a hybrid mattress's coil system offers easy air circulation, keeping the base layer cool.
The material used for the mattress's remaining layers is what sets hybrid mattresses apart in their cooling capabilities. As explained above, latex and temperature-neutral foam mattresses offer cooling relief while memory foam stores heat.
Hopefully, this in-depth look at mattress materials has helped you narrow down your search for a cooling mattress. Aside from choosing the type of mattress you plan to buy, you should consider a few other differentiating factors. As you compare your options, keep these tips in mind:
Nothing beats climbing into a cool and comfortable bed, snuggling with your pillows or blankets, and drifting off to sleep. But for too many people, their own heat makes this impossible, even in the winter.
For restorative sleep, you need a mattress that sleeps consistently despite the temperature outside and works alongside your body's natural cooling system. Fortunately, hot sleepers have plenty of cooling mattress options—you just need to know what to look for.