Milliard 4.5-inch Memory Foam Replacement Mattress It doesn’t take much to improve upon the busted, old mattress—or the disappointing new one—lurking in your sofa bed. This is a great start.

the Milliard memory foam mattress is our overall pick for a sleeper sofa replacement. The plush-to-medium firmness is ...

The result is roughly a queen-sized mattress, low to the ground, which you can make like a regular bed with regular sheets. The seatback of the sofa has hidden compartments that guests can use ...