How to Choose a Sofa Bed With the Right Mattress Thickness

Mattress thickness is one of the quietest yet most important decisions when choosing a sofa bed. It dictates how the bed feels overnight, how the sofa sits during the day and how long the whole piece lasts. This guide walks through the depth bands you will see on UK sofa beds, from slim 8 cm pads on click clack frames to 15 cm sprung mattresses on premium pull out actions. It explains how foam, sprung and pocket sprung cores compare, why each frame type limits your options and how to think about daytime seat height in a small room. There is practical advice on toppers, cover fabrics and airing routines, plus an FAQ covering nightly use, replacements and freshening older sofa beds, helping UK shoppers match mattress depth to how the sofa bed is actually used....