The two mattress brands that are represented in the crossword solutions are Sealy and Serta. Sealy is an American-based mattress and bedding manufacturer that was founded in 1881. It is one of the oldest and most well-known mattress brands in the world. Serta is also an American-based mattress and bedding manufacturer that was founded in 1931. It is known for its innovative designs and technologies, such as its Perfect Sleeper mattress. Both Sealy and Serta offer a wide range of mattress types, sizes, and styles to suit different sleepers' needs.