席梦思曾是美国三大床垫制造商之一，旗舰品牌是Beautyrest。于1870年由美国人席梦思创立。而席梦思的创立,是源于美国家具商扎尔蒙·席梦思的研究和思考。在100多年前，全世界的人们都睡在硬木板床上，很多购买家具的顾客向席梦思抱怨床板太硬，于是他开始苦苦思索如何让大家睡得更好。1900年，世界上第一个用布包着的弹簧床垫推上市场，从此改变了人们的睡眠习惯，大家用发明人的姓为它命名，席梦思也用自己的名字成立了弹簧床品牌。1925年发明了能批量生产独立袋装弹簧床垫的机器，使独立袋装弹簧床垫得以广泛应用。1931年，席梦思发现人类睡眠姿势每夜平均改变达35次，这项研究也奠定了今日睡眠科技的基础，之后席梦思也着手将床垫朝同床不相互干扰的方向研发。

The Simmons Bedding Company is an American major manufacturer of mattresses and related bedding products, based in Atlanta, Georgia. The company was founded in 1870, and is one of the oldest companies of its kind in the United States. Simmons' flagship brand is Beautyrest. In addition to operating 18 manufacturing facilities in the United States and Puerto Rico, the company licenses its products internationally. According to a Simmons press release, net sales for 2005 were $855 million, and its revenue was $1.13 billion in 2007 and $1.228 billion in 2013. As of 2011, Simmons ranked in third place among U.S. mattress manufacturers, with a 15.7 percent market share. In 2012, Simmons and its sister company Serta International were acquired by American private equity company Advent International.