A continuously height adjustable mattress support and apparatus therefor is disclosed. The mattress support is vertically displaceable by means of at least one drive unit for applying a vertical force to a corresponding solely vertically displaceable driven component and is stabilized during vertical displacement by at least one stabilizing means connected thereto. The driven component is connected to, or is in supporting relation with, the mattress support, so that a height of the mattress support above a floor surface is settable and continuously adjustable by means of at least one actuator associated with the at least one drive unit. In one embodiment, a locking device for preventing displacement of the mattress support following inadvertent actuation of the at least one drive unit is employed.