An apparatus for providing positive airway pressure comprises a blower configured to provide pressurized air to a patient interface and a controller configured to control an air pressure provided by the blower at a first therapeutic pressure treatment level during a first treatment session detect the occurrence of sleep disordered breathing (SOS) events during the first treatment session and adjust the first therapeutic pressure treatment level in response to the detected SOS events during the first treatment session in a setting procedure and determine a second generally constant therapeutic pressure treatment level to be provided in a second treatment session. The second treatment session is subsequent to the first treatment session and the second generally constant therapeutic pressure treatment level is determined based on checking of a clock and the SOS events detected from the first treatment session. The controller is further configured to comprise maintain the air pressure at the second generally constant therapeutic pressure treatment level without changing the therapeutic pressure treatment level during the second treatment session. The first treatment session comprises at least one sleep session and the second treatment session comprises a different sleep session.
