In OSU we have a state of the art Heart Failure Program and a Sleep Heart program that was created to develop an approach to prompt diagnosis and treatment of SDB in our heart failure patients. We designed an algorithm that employs validated questionnaires and FDA approved devices. We need, however to validate our algorithm against the gold standard: the PSG. Furthermore, we need to analyze the prevalence and risk factors of each sleep disorder in light of the recent changes in the management of heart failure, which may have influenced the risk factors and prevalence as we knew them. This protocol includes a combination of clinically indicated procedures, and others that are repeated for validation purposes. The accumulation and analysis of data is also done for research purposes.