For when your in-laws come to town, your friend swings by for the night, or your kid wants to have a sleepover, a sleeper sofa can be the save-the-day piece of furniture. More expensive than a traditional sofa, sleeper sofas are worth the investment as they make your living room double as a guest room too. Sleeper sofas come in a wide variety of styles and shapes. The style that is best for you will depend on which will fit best in your space and your personal preferences. We recommend measuring your space to ensure that not only the sofa will fit perfectly, but will be able to fit through your door frames and into your home. Here are the most common types of sleeper sofas: The Good Housekeeping Institute Textiles Lab, comprised of experts and engineers who test fabric, furniture, and textiles every day, rounded up the best online sleeper sofas according to categorical expertise, reputable user reviews, and responses from our panel of consumer testers. Our top picks all have high marks for being super comfy to lounge on as a couch and to sleep on at night. When looking for a comfortable sleeper sofa, you need to look for two things: the upholstery and the mattress. For sofa beds...