Group 2- Standard care Patients will be fitted with a mask and given a CPAP and instructed on how to use the device. Each CPAP machine will be provided with a modem sending daily compliance and adherence information to MyOSA web site but no intervention based on these data is planned in this group. All patients will be visited at 1, 3 and 6 months at sleep unit. Patients will be checked about progress and adherence to therapy and any problems with their machine. Information will be downloaded from their machines (CPAP adherence, applied CPAP pressure, mask leak, and residual respiratory events…).