Split adjustable mattress foundation for multiple users

A process for forming an adjustable foundation dimensioned to support a mattress configured to accommodate two supine users, the process comprising:

• laterally connecting a first sub-foundation abutting a second foundation to define the adjustable foundation, wherein each of the first and second sub-foundations includes a mattress support surface collectively configured to support the mattress dimensioned to accommodate the two supine users, the mattress support surface including a head and back section hingedly connected to an intermediate seat section at one end and a leg and foot section hingedly connected to the intermediate seat section at another end, wherein the intermediate seat section includes a first portion and a second portion, wherein the first portion is hingedly connected to the head and back section and the second portion is hingedly connected to the leg and foot section, wherein the first sub-foundation comprises a linkage assembly including one or more torsional members each coupled to one or more motorized actuators to effect inclination or declination of the head and back section and/or the leg and foot section, and wherein the second sub-foundation is free of a motorized actuator and comprises linkage assembly including one or more torsional members;
• and
• mechanically connecting a shaft to the torsional members in the first sub-foundation to the torsional members in the second sub-foundation such that the motorized actuator in the first sub-foundation effects inclination or declination of the head and back section and/or the leg and foot section in the second sub-foundation.