Reply from our Silentnight Expert:
Unless you have bought a "no turn" mattress, which will be indicated on the mattress label, it is important that you turn your mattress once a week for the first two or three months and then monthly thereafter. This will prolong the lifespan of your mattress.
"No Turn" mattresses will benefit from being rotated from top-to-tail periodically to ensure even wear. When turning your mattress please do not allow it to bang or fall against the side of the bed as this may damage the spring system. Some assistance may be required.