CPAP treatment apparatus is disclosed having a controllable flow generator operable to produce breathable gas at a treatment pressure elevated above atmosphere to a patient by a delivery tube coupled to a mask having connection with a patient’s airway. Preferably, the agent comprises at least a portion of a botulinum toxin. The controller produces control data on the basis of a comparison between the position data and a predetermined or pre-programmed position of the head to lay a brick at a predetermined position for the building under construction.