A sleeper sofa is a space-efficient way to put guests up for the night and have somewhere to sit during the day. But the mattresses that come with sofa beds can be thin and uncomfortable.

A sleeper-sofa mattress upgrade: Milliard 4.5-inch Memory Foam Replacement Mattress It doesn’t take much to improve upon the busted, old mattress—or the disappointing new one—lurking in your ...

Two things can be true at once: Sleeper sofas are a feat of engineering, and they can be the bane of your existence. It’s a marvel to fit a bulky piece of furniture inside another, equally bulky ...