Roll Together (Mattress Motion Transfer)
Entity: roll together mattress
In short
Roll-together is the tendency for two sleepers to drift toward the centre of a mattress as the surface forms a shared depression. Open-coil beds with linked springs often show more roll-together than independently pocketed units. Memory foam and latex can reduce the sensation by isolating motion. Soft surfaces still allow some shared sink.
Definition. Roll-together is when partners drift toward the centre of a mattress. Linked springs or soft fillings form one shared depression in the middle.
Open-coil Bonnell grids share load across linked wires. That encourages a single depression. Pocketed coils and many foam or latex surfaces reduce that shared motion. Very soft beds can still create centre sink. See pocket sprung vs open coil and What does roll-together mean?.