10 Best Mattresses for Keeping Cool (September 2026) Tested Picks
You wake up at 3 AM, sheets damp, pillow flipped to the cool side for the fourth time. Your body generates 75 to 100 watts of heat during sleep, roughly the same as an old incandescent bulb, and most mattresses act like an insulator, trapping every bit of it against your skin. After 14 months … Read more