Patients accepting CPAP therapy after the training session will be motivated to use it for at least 4 > hours sleep/night over one week. Additional nocturnal pulse oximetry will be obtained. Patients will be coached by trained nurses during the night. Relatives will also be trained in using the humidifier and cleaning the mask and the humidifier chamber. Data card AHI, oximetry and leakage information will be collected every day. Pressure limits can be increased or decreased to improve patient comfort. If patients consider the interface uncomfortable, it may be changed.