A Sofa Made by a Mattress Company: Serta Futons Armless Sleeper Serta is traditionally a mattress company, so you know this Serta Futons Armless Sleeper ($247) will be incredibly comfortable to sleep on. Plus, it looks modern and minimal, which we love. Image Source: wayfair.com Serta Futons Armless Sleeper $247 from wayfair.com Buy Now