Benefit of One Month Zopiclone Intake on Adaptative Servoventilation Compliance

Inclusion Criteria: * Male or female aged between 18 and 90 years at the initial visit * Central Sleep Apnea with an AHI ≥ 15/h and at least 50% of central events indicating an ASV therapy, as determined by a ventilatory polygraphy (PG) or a polysomnography (PSG) * Cardiac Dysfunction with Left Ventricular Ejection fraction(LVEF)\> 45% determined by a transthoracic echocardiography (TTE), known for more than 12 weeks and stable for at least 4 weeks; * Compliance less than 3 hours after 7 days of the setting up of ASV; * Patient affiliated to a social security scheme or being beneficiary of such scheme; * Patient voluntarily participating in the research, with written informed consent Exclusion Criteria: * Current use of continuous positive airway pressure (cPAP) for treatment of sleep apnea during the last 12 months * Presence of chronic symptomatic heart failure with reduced left ventricular ejection fraction (LVEF ≤ 45%), and a CSA moderate to severe (AHI ≥15 / h) * Presence of severe pulmonary bullous disease * Presence of Pneumothorax or pneumomediastinum * Hypotension, especially if associated with depletion of intravascular volume * Dehydration * Leaking of cerebrospinal fluid, cranial surgery or trauma recently. * Episode of acute respiratory failure or heart failure in the previous month