Inclusion criteria:  18 years of age or older Patient newly CPAP-treated and eligible for care and for the reimbursement by the French Social Security rules Signed informed consent  Exclusion criteria:  Previous CPAP-treatment Pregnancy Inability to understand the nature and aims of the study or to communicate with the investigator Simultaneous participation in another trial with an exclusion clause to participate in another trial No affiliation with the French social security regime Loss of personal capacity resulting in state protection Deprivation of liberty by judicial or administrative decision