It's two pieces of furniture for the price of one and pretty much essential for anyone without the luxury of a guest bedroom. Every home should have one.
6 of the best: Sofa beds under £500
Yoko sofa bed in cream leather, £149, Made.com
Luke sofa bed, £480, Kalusto
Barney sofa bed, £499, John Lewis
Woodstock three seat sofa bed in charcoal, £499, Habitat
King sofa bed with back cushions, £379, Dekko
Piso sofa bed in grey, £299, Dwell