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How to buy a sofa bed
The first thing to determine is how you're going to use it.
Most manufacturers emphasize either sitting comfort or sleeping comfort, but very few consider both. So it's important to think about whether you want it primarily for use as a sofa or a bed.
A sofa bed is always a compromise; it is never the best sofa or the best bed available. Have an idea of what you're willing to pay before you go shopping.