If you’ve been sleeping with a fan on full blast, the windows swung open and duvet in a bundle at the bottom of the bed, I’d recommend getting a mattress topper that helps rather than worsens overheating during the night, so you can get a comfortably cool night’s sleep.
Memory foam is brilliant if you want cushy comfort, but it’s not the best when it comes to trapping heat. If you want the best of both worlds, I’d say that Panda’s bamboo mattress topper is the next best thing. In my review of the best mattress toppers, it was the best memory foam option, largely because of how well it blends deep pressure relief with supportive comfort.