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, 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 within a delivered gas pressure window comprising a minimum pressure limit and a maximum pressure limit; characterized in that the hardware controller is further configured to repeatedly maintain or adjust the delivered gas pressure window as a function of parameters measured during the course of the current therapy session and/or one or more previous therapy sessions; wherein if the patient spends a percentage of time at the maximum pressure limit that is greater than or equal to a threshold percentage of time at the maximum pressure limit over the course of one or more therapy sessions, the maximum pressure limit is increased, or if the patient spends a percentage of time at the maximum pressure limit that is less than or equal to a threshold percentage of time at the maximum pressure limit over the course of one or more therapy sessions, the maximum pressure limit is decreased. 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, 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 within a delivered gas pressure window comprising a minimum pressure limit and a maximum pressure limit; characterized in that the hardware controller is further configured to repeatedly maintain or adjust the delivered gas pressure window as a function of parameters measured during the course of the current therapy session and/or one or more previous therapy sessions; wherein if the patient spends a percentage of time at the maximum pressure limit that is greater than or equal to a threshold percentage of time at the maximum pressure limit over the course of one or more therapy sessions, the maximum pressure limit is increased, or if the patient spends a percentage of time at the maximum pressure limit that is less than or equal to a threshold percentage of time at the maximum pressure limit over the course of one or more therapy sessions, the maximum pressure limit is decreased. 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, 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 within a delivered gas pressure window comprising a minimum pressure limit and a maximum pressure limit; characterized in that the hardware controller is further configured to repeatedly maintain or adjust the delivered gas pressure window as a function of parameters measured during the course of the current therapy session and/or one or more previous therapy sessions; wherein if the patient spends a percentage of time at the maximum pressure limit that is greater than or equal to a threshold percentage of time at the maximum pressure limit over the course of one or more therapy sessions, the maximum pressure limit is increased, or if the patient spends a percentage of time at the maximum pressure limit that is less than or equal to a threshold percentage of time at the maximum pressure limit over the course of one or more therapy sessions, the maximum pressure limit is decreased.