An adjustable bed system, comprising: a pair of side rails transversely spaced, longitudinally aligned and arranged parallel to each other; and a pair of lifting assemblies attached respectively to the pair of side rails for operably adjusting positions of at least one part of a bed, wherein each lifting assembly comprises: a back lifting arm and a leg lifting mechanism; a bracket; and a back lifting actuator and a leg lifting actuator received in the bracket, wherein each of the back and leg lifting actuators comprises an activation member (140a/140b) and a motor member (150a/150b) engaged with the activation member (140a/140b) for driving the activation member (140a/140b), wherein the activation member of the back lifting actuator is engaged with the back lifting arm for operably adjusting the back lifting arm at desired back positions, and the activation member of the leg lifting actuator is engaged to the leg lifting mechanism for operably adjusting the leg lifting mechanism at desired leg positions, characterized in that the bracket comprises a base member attached to a respective one of the pair of side rails, a pair of tab members (114, 115) vertically attached to the base member, and a pair of bars (117a, 117b) transversely attached to top portions of the pair of tab members (114, 115). a pair of side rails transversely spaced, longitudinally aligned and arranged parallel to each other; and a pair of lifting assemblies attached respectively to the pair of side rails for operably adjusting positions of at least one part of a bed, wherein each lifting assembly comprises: a back lifting arm and a leg lifting mechanism; a bracket; and a back lifting actuator and a leg lifting actuator received in the bracket, wherein each of the back and leg lifting actuators comprises an activation member (140a/140b) and a motor member (150a/150b) engaged with the activation member (140a/140b) for driving the activation member (140a/140b), wherein the activation member of the back lifting actuator is engaged with the back lifting arm for operably adjusting the back lifting arm at desired back positions, and the activation member of the leg lifting actuator is engaged to the leg lifting mechanism for operably adjusting the leg lifting mechanism at desired leg positions, characterized in that the bracket comprises a base member attached to a respective one of the pair of side rails, a pair of tab members (114, 115) vertically attached to the base member, and a pair of bars (117a, 117b) transversely attached to top portions of the pair of tab members (114, 115). a back lifting arm and a leg lifting mechanism; a bracket; and a back lifting actuator and a leg lifting actuator received in the bracket, wherein each of the back and leg lifting actuators comprises an activation member (140a/140b) and a motor member (150a/150b) engaged with the activation member (140a/140b) for driving the activation member (140a/140b), wherein the activation member of the back lifting actuator is engaged with the back lifting arm for operably adjusting the back lifting arm at desired back positions, and the activation member of the leg lifting actuator is engaged to the leg lifting mechanism for operably adjusting the leg lifting mechanism at desired leg positions, characterized in that the bracket comprises a base member attached to a respective one of the pair of side rails, a pair of tab members (114, 115) vertically attached to the base member, and a pair of bars (117a, 117b) transversely attached to top portions of the pair of tab members (114, 115).