Serta Mattress is the No. 1 advertised bedding brand in the United States, with its award-winning Serta Counting Sheep commercials. The company is also the No. 2 bedding manufacturer in the United States, with regards to annual sales volume. Serta was established in 1931 at the height of the Great Depression. At that time 13 independent mattress manufacturers joined together to form Serta. The...