Cooling mattresses offer precise temperature control that may reduce nighttime awakenings and support deeper sleep, especially for hot sleepers and menopausal women.
Walk into any mattress store or scroll through Instagram and you’ll see an explosion of products promising a cooler, deeper sleep. Companies like Eight Sleep, Sleepme (maker of the ChiliPad), Tempur-Pedic and others now market active cooling mattresses and mattress toppers designed to regulate temperature throughout the night. Passive cooling to mattress toppers are offered by such brands like Viscosoft, GhostBed and Alwyn Home.
This surge is driven not only by consumer demand, but by the mainstreaming of sleep science promoted by influential voices like Matt Walker, Andrew Huberman and Peter Attia. Eight Sleep even highlights that Elon Musk and Mark Zuckerberg use its products. With temperature regulation increasingly recognized as central to sleep quality, a key question is whether these cooling mattresses actually work.
Here are six things to know about the evidence and other considerations surrounding cooling mattresses as well as some low cost alternatives worth considering.
1. Why Temperature Matters for High-Quality Sleep
Temperature plays a fundamental role in both falling asleep and maintaining sleep. Core body temperature naturally decreases by about one to two degrees Fahrenheit in the hours before bedtime. The temperature decrease sends a circadian signal that helps trigger melatonin release, reduce metabolic activity and prepare the brain for rest. When the body cannot cool—due to a warm bedroom, heat-retaining bedding or physiologic factors such as menopause—sleep often becomes lighter, more fragmented and more difficult to sustain.
Temperature also influences sleep architecture. Deep, slow-wave sleep (N3) is one of the most restorative stages, supporting tissue repair, immune health, memory consolidation and metabolic stability. Deep sleep is more easily achieved when core temperature is lower, while overheating increases wakefulness and reduces sleep continuity.
This helps explain why hot sleepers, menopausal women and athletes with high nighttime heat output sometimes struggle with restorative rest. Lowering sleep temperature through environmental strategies, including cooling mattresses, may help mitigate these physiologic barriers.
2. How Cooling Mattresses Like Eight Sleep Work
Cooling mattresses and toppers fall into two broad categories: active cooling and passive cooling.
Active cooling systems use water or air circulation to pull heat away from the body. They maintain a consistent temperature throughout the night and can adjust settings dynamically based on sleep stage or environmental conditions. Because they continuously move heat rather than absorb it, active systems deliver more sustained temperature control. Many include smartphone apps that track sleep metrics and personalize temperature profiles.
Passive cooling toppers, by contrast, rely on materials like gel-infused foams, open-cell foams, copper or graphite infusions or phase-change materials. These can create a cooler sensation during the first few hours of sleep. But passive toppers gradually warm as they reach thermal equilibrium, which limits sustained cooling throughout the night.
Price is also a major distinction. An Eight Sleep cooling mattress typically costs $2,500–$5,000 plus a $17–$25 monthly fee. Sleepme’s ChiliPad ranges from $700– $1,500. Passive toppers are far less expensive, with Alwyn Home models costing $60-$120 and GhostBed’s 3-inch Memory Foam Topper starting around $270.
3. Cooling Mattresses Like Eight Sleep And Others Improve Sleep Quality
Research shows that active cooling systems have the strongest scientific support. Active cooling has been shown to help people fall asleep faster, reduce nighttime awakenings and create more stable sleep architecture throughout the night.
Many studies report modest increases in deep, slow-wave sleep. For example, one randomized crossover trial found that slow wave sleep increased by 16% compared to a traditional mattress. A recent meta-analysis further supports these findings, showing that while active cooling improves subjective sleep quality and reduces wake-after-sleep onset, but do not reliably increase total sleep time in healthy adults.
The benefits of active cooling appear most pronounced in people with impaired thermoregulation or high nighttime heat load, such as menopausal women experiencing night sweats, hot sleepers, individuals living in warm climates and athletes recovering from strenuous activity. For example, a 2022 study of menopausal women found that a cooling mattress pad significantly reduced sleep disturbances related to night sweats and improved subjective sleep quality. Studies conducted in hot environments similarly show that targeted cooling improves sleep efficiency and comfort.
Passive cooling mattresses, by contrast, have a much weaker evidence base. Foam materials tend to trap heat when compressed under body weight. Although manufacturers incorporate gels, perforations and phase-change materials to counteract this, the cooling effects diminish as materials warm over time.
Some small studies have found that passive cooling can lower body temperature or improve deep sleep early in the night, but meta-analyses show inconsistent effects on sleep onset latency, sleep efficiency, total sleep time and time spent in specific sleep stages. The relative lack of strong evidence may reflect that fewer studies exist in the space rather than their ineffectiveness. Nevertheless, the research favors active cooling systems over passive approaches at this point.
4. Cooling Mattresses Help Other Recovery Parameters
Many cooling mattress products target athletes and high-performance users, claiming enhanced recovery. Early research suggests some validity to these claims. In small studies, athletes using active cooling systems demonstrate lower resting heart rates, higher heart rate variability (HRV) and improved next-day readiness scores. These markers reflect improved autonomic balance and overnight recovery.
Cooler sleep reduces sympathetic nervous system activity and nighttime metabolic demands, both which support physiologic restoration. Enhanced deep sleep may also boost growth hormone release and tissue repair. However, much of this research remains early and is limited by small sample sizes. Larger, trials are needed to confirm these effects.
5. Buying an Active Cooling System Has Practical Considerations
Beyond cost, there are other considerations when it comes to cooling mattresses. Importantly, active cooling systems require ongoing maintenance. Some devices generate noise, require periodic descaling, water refills or filter changes and may have a learning curve to optimize settings. Passive toppers require less upkeep but may lose effectiveness over time if the foams degrade.
Overcooling is another common issue. Some users find active systems too cold in winter or wake up chilled when temperatures are set too low. Because comfort varies widely, trial periods and return policies are important considerations. Durability also matters: water-based systems introduce the possibility of leaks, pump issues or device failure.
6. There Are Ways to Improve Sleep Temperature Without an Active Cooling Mattress
Cooling technology can help, but many people can also meaningfully improve sleep temperature with simple, low-cost strategies.
Setting the bedroom between 60 and 67 degrees, using breathable bedding materials like cotton, linen or bamboo and avoiding heat-retaining foam toppers can help the body maintain its natural nighttime cooling. Increasing airflow with fans or cross-ventilation is also effective, as is taking a warm shower one to two hours before bed, which promotes a post-shower cooling response as heat dissipates through the skin.
Even wearing socks can improve thermoregulation by enhancing vasodilation in the hands and feet, helping the core shed heat more efficiently. Such behavioral approaches should be seen as foundational, with cooling mattresses serving as an optional enhancement for those who continue to struggle with sleep.
Ultimately, temperature regulation is an important and often overlooked component of high-quality sleep. Cooling mattresses and in particular active cooling systems offer a scientifically grounded way to support deeper sleep, reduce nighttime awakenings and potentially improve recovery. Passive cooling mattresses provide some benefits but offer less consistent effects.
More research is needed on optimizing the human sleep environment, especially large, independently funded trials on cooling mattresses and other interventions. Still, the early evidence is encouraging for active cooling mattresses like Eight Sleep. For hot sleepers, menopausal women, athletes and individuals with fragmented sleep, cooling mattresses may be worth exploring as part of a comprehensive strategy for better sleep and long-term health.