Your Definitive Guide to the Best Cooling Mattresses of 2020 Hello, summer. Sunshine, blue skies and, oh yeah, scorching heat. Nothing is immune to the mind-numbing grasp of summer’s heat—not even your sleep. If you’ve ever fallen asleep nice and cool only to wake up a few hours later in a puddle of sweat (gross, we know), you’re not alone. Whether you’re simply a hot sleeper or your place doesn’t get as cool as you’d like, don’t sweat it—we have your definitive guide to the best cooling mattresses of 2020.