In patients with heart failure, the prevalence of Obstructive Sleep Apnea (OSA) was estimated at 24-37 % and Central Sleep Apnea (CSA) at 40%. The severity of CSA is shown to be directly related to the severity of the underlying heart failure[8]. Additionally, the management of heart failure has changed significantly since these original studies, to include b-blockade, aggressive hemodynamic targets, and device therapy[9]. Taken together, these observations call into question the applicability of this previous prevalence estimate of CSA in this patient population. Indeed, recent data suggest a decline in the incidence of CSA[10, 11]. Obstructive Sleep Apnea, on the other hand, is strongly associated with obesity. The rising incidence of obesity, and its strong association with cardiovascular disease, may suggest a rise in the incidence of OSA in this patient population.