A bed bridge one practical product you can have, in case you need some sort of bed extension or converter, when you still have a mattress that’s good to use for a couple more years or when you do not have the budget to buy a new one just yet:

There’s no reason to buy a costly king size bed, when you can simply convert two twins to meet your needs. Made of soft and supportive hypo-allergenic polyurethane foam, this bed bridge bridges the gap, leaving no ridges or lumps. Seam where beds are joined is hidden. 70″ L x 14″ W. 2-year warranty.

This item may be found at Bed Bath & Beyond