Does memory foam sleep hot, and how can you keep it cooler?

Traditional memory foam can sleep warm because its dense, closely contouring structure traps body heat and limits airflow. Modern foams counter this with open-cell construction, gel or graphite infusions, and breathable covers. You can also cool things down with a more breathable bed frame that allows air underneath, moisture-wicking sheets, and avoiding heavy mattress toppers that seal in heat.