Sleep Number Corporation, formerly known as Select Comfort Corporation, is a designer, manufacturer, and retailer of high-end mattresses and bedding accessories. The company was founded in 1987 and is headquartered in Minneapolis, Minnesota. Sleep Number's flagship product is the Sleep Number bed, which allows users to adjust the firmness and support of their mattress using a remote control. The company operates over 600 retail stores across the United States and employs over 4,000 people.