A base (100; 200; 400) for a bed, the base comprising a frame (102; 202; 402) and a mattress support (104; 204) extending along a longitudinal direction of the frame and including: a first set of mattress supporting elements (110; 210; 410), a second set of mattress supporting elements (120; 220; 420) and a third set of mattress supporting elements (130; 230; 430), wherein each of the first, second and third set of mattress supporting elements includes one or more supporting elements, each supporting element presenting a mattress supporting surface for bearing against an underside of a mattress, wherein the first set of mattress supporting elements is pivotable, in relation to the frame, and movable along the longitudinal direction, and wherein the first set of mattress supporting elements is arranged to be moved along the longitudinal direction such that a separation, along the longitudinal direction, between the second set of mattress supporting elements and a mattress supporting element of the first set of mattress supporting elements which is closest to the third set of mattress supporting elements is increased while an inclination of the first set of mattress supporting elements is increased, wherein the third set of mattress supporting elements is arranged to be moved along the longitudinal direction of the frame such that a separation, along the longitudinal direction, between said mattress supporting element of the first set of mattress supporting elements and the third set of mattress supporting elements, and a separation, along the longitudinal direction, between the third set of mattress supporting elements and the second set of mattress supporting elements, are increased, while the inclination of the first set of mattress supporting elements is increased, characterised in that the movement of the third set of mattress supporting elements is mechanically coupled to an adjustment of the inclination of the first set of mattress supporting elements by a coupling element (280; 480) arranged to pull the third set of mattress supporting elements along the frame while the inclination of the first set of mattress supporting elements is increased. a first set of mattress supporting elements (110; 210; 410), a second set of mattress supporting elements (120; 220; 420) and a third set of mattress supporting elements (130; 230; 430), wherein each of the first, second and third set of mattress supporting elements includes one or more supporting elements, each supporting element presenting a mattress supporting surface for bearing against an underside of a mattress, wherein the first set of mattress supporting elements is pivotable, in relation to the frame, and movable along the longitudinal direction, and wherein the first set of mattress supporting elements is arranged to be moved along the longitudinal direction such that a separation, along the longitudinal direction, between the second set of mattress supporting elements and a mattress supporting element of the first set of mattress supporting elements which is closest to the third set of mattress supporting elements is increased while an inclination of the first set of mattress supporting elements is increased, wherein the third set of mattress supporting elements is arranged to be moved along the longitudinal direction of the frame such that a separation, along the longitudinal direction, between said mattress supporting element of the first set of mattress supporting elements and the third set of mattress supporting elements, and a separation, along the longitudinal direction, between the third set of mattress supporting elements and the second set of mattress supporting elements, are increased, while the inclination of the first set of mattress supporting elements is increased, characterised in that the movement of the third set of mattress supporting elements is mechanically coupled to an adjustment of the inclination of the first set of mattress supporting elements by a coupling element (280; 480) arranged to pull the third set of mattress supporting elements along the frame while the inclination of the first set of mattress supporting elements is increased.