There is described a system for adjusting the height of a patient support surface on a bed, comprising: one or more height adjustment actuators operable to adjust a height of the patient support surface above a floor surface; a controller connected to the one or more height adjustment actuators, the controller including a memory; and one or more user interface units connected to the controller, wherein the controller is configured to record as a stored actuator state a current state of the one or more height adjustment actuators in the memory in response to a first input signal from the one or more interface units, and is configured to operate the one or more height adjustment actuators to automatically return them to the stored actuator state in response to a second input signal from the one or more interface units. Alternatively, or in addition, the controller may be configured to provide an indication to a user when the one or more height adjustment actuators have returned to the stored actuator state during a subsequent height adjustment operation.