I'm a mattress tester, and this is the ideal mattress thickness – because yes, depth does matter

A bedroom with a bay window dressed with grey floor-length curtains and half-height shutters.

Shopping for a new mattress can be overwhelming – the choice, the types, the price – it can feel like just as you get to grips with one decision, another arises.

One of those questions you might be pondering is, does mattress depth matter? If you've been researching specifications and come across all sorts of measurements, you might also be wondering what the standard mattress thickness is.