See which sleeper sofas interior design experts recommend, including picks from Pottery Barn, Cozey and Joybird.

Plus, designers note, sofas with curves can more comfortably seat a crowd during a party. “No straight-line sofa breaks up the grid of a room plan nor affords so much seating at a party,” says Weisman ...

The Ebern Designs three-piece sectional sofa, which seats four people and includes a glass-top coffee table, proves that even small patios, balconies, and decks can become relaxing sanctuaries.

Does your sectional couch always look like an unmade bed? Designers debate the merits of tidy—and newly trendy—solid-backed sectionals vs. more pillow designs.

Modular and low-slung, it is upholstered in a bright, mint-green leather and informed by the best Italian mid-century designs. “Sofas are a difficult thing to design, because they have to be ...