A 2-inch memory foam topper can add a layer of luxury for a fraction of the cost, though it may need to be stored separately if it’s too thick for the sofa to close.

Modern replacements have moved far beyond the thin, squeaky innersprings of the past.

If a full replacement isn't in the budget, you can still improve the sleep quality:

Ensure the foam is CertiPUR-US® certified , meaning it’s made without harmful chemicals like formaldehyde or heavy metals.