Methods and apparatus provide positive airway pressure. They may include a blower configured to provide pressurized air to a patient interface and a controller. The controller can be configured to control an air pressure of the pressurized air provided by the blower during a first treatment session. The controller can be configured to detect sleep disordered breathing (SDB) events during the first treatment session. The controller can be configured to adjust the air pressure in response to the detected SDB events during the first treatment session. The controller can be configured to determine a first therapeutic pressure treatment level based on the SDB events detected during the first treatment session. The controller can be configured to maintain the air pressure at the first therapeutic pressure treatment level during a second treatment session.
