A respiratory therapy system comprising: a flow generator adapted to provide pressurized gases to a patient, a sensor adapted to measure at least one characteristic capable of being used to determine one or more traits of a sleep-disordered breathing event (SDBE) of the patient, and a hardware controller configured to: receive the at least one characteristic measured by the sensor, determine the one or more traits of the SDBE of the patient by analyzing the at least one characteristic, repeatedly adjust a pressure window comprising a minimum pressure limit and a maximum pressure limit in response to pressure delivered during the course of the current therapy session and/or one or more previous therapy sessions; and control the flow generator to deliver pressurized gases, the pressure of the pressurized gases being at least in part based on the determined one or more traits of the SDBE, and the pressure of the pressurized gases being greater than or equal to the minimum pressure limit and less than or equal to the maximum pressure limit, wherein the minimum pressure limit is less than the maximum pressure limit, and wherein if the patient experiences a number of delivered pressure increases greater than a predetermined number over a predetermined period of time at or near the minimum pressure limit, the minimum pressure limit is increased. a flow generator adapted to provide pressurized gases to a patient, a sensor adapted to measure at least one characteristic capable of being used to determine one or more traits of a sleep-disordered breathing event (SDBE) of the patient, and a hardware controller configured to: receive the at least one characteristic measured by the sensor, determine the one or more traits of the SDBE of the patient by analyzing the at least one characteristic, repeatedly adjust a pressure window comprising a minimum pressure limit and a maximum pressure limit in response to pressure delivered during the course of the current therapy session and/or one or more previous therapy sessions; and control the flow generator to deliver pressurized gases, the pressure of the pressurized gases being at least in part based on the determined one or more traits of the SDBE, and the pressure of the pressurized gases being greater than or equal to the minimum pressure limit and less than or equal to the maximum pressure limit, wherein the minimum pressure limit is less than the maximum pressure limit, and wherein if the patient experiences a number of delivered pressure increases greater than a predetermined number over a predetermined period of time at or near the minimum pressure limit, the minimum pressure limit is increased. receive the at least one characteristic measured by the sensor, determine the one or more traits of the SDBE of the patient by analyzing the at least one characteristic, repeatedly adjust a pressure window comprising a minimum pressure limit and a maximum pressure limit in response to pressure delivered during the course of the current therapy session and/or one or more previous therapy sessions; and control the flow generator to deliver pressurized gases, the pressure of the pressurized gases being at least in part based on the determined one or more traits of the SDBE, and the pressure of the pressurized gases being greater than or equal to the minimum pressure limit and less than or equal to the maximum pressure limit, wherein the minimum pressure limit is less than the maximum pressure limit, and wherein if the patient experiences a number of delivered pressure increases greater than a predetermined number over a predetermined period of time at or near the minimum pressure limit, the minimum pressure limit is increased.