 The FTC has unanimously voted to bring a lawsuit against mattress maker Tempur-Sealy to block its $4 billion acquisition of Mattress Firm, saying the deal would allow the world's largest mattress supplier to suppress competition that would result in higher prices for shoppers. The combined companies would have a total of some 3,000 retail stores, 30 e-commerce platforms, 71 manufacturing facilities, and four research and development facilities worldwide. John Scott reporting.