These days, many major mattress companies are offering memory foam mattresses with some variation of temperature control or "cooling technology". Many times, "cooling technology" simply means that a gel layer has been incorporated into the design in an attempt to counteract memory foam’s heat trapping tendency. The cool gel layer is added to the temperature control mattress while the claim is made that it will keep you cool throughout the night as you sleep. After buying this type of bed, many new cool gel memory foam mattress owners find that although it's comfortable to sleep on, they're now lying awake at night and wondering, "why do I sweat so much when I sleep now?"
Does a Cooling Mattress Really Work?
Although cooling gel and other mattress materials are often advertised as being breakthrough materials that will benefit sleepers everywhere, the truth is that "cooling technology" mattresses do little to truly keep people cool because they do not address the real reason you're waking up hot and sweaty while you're sleeping: Trapped heat and humidity in your bed.
Many people who purchase these specialized mattresses - especially from mattress-in-a-box brands - are finding that a cool memory foam mattress actually retains heat and they still wake up sweating during the night. The sleeper tosses and turns all night trying to find relief, only to end up making the bed warmer with all the movement. Unfortunately, when you have a memory foam mattress, you sink into the memory foam as you sink into sleep, and as the material forms snugly around your body contours, it also tends to retain a lot of your body heat.