Cardiac dysfunction during sleep.
D001145:Arrhythmias, Cardiac / Q000209:etiology; D001341:Autonomic Nervous System / Q000502:physiology; D002302:Cardiac Output; D003326:Coronary Circulation; D004562:Electrocardiography; D006339:Heart Rate; D006801:Humans; D012891:Sleep Apnea Syndromes / Q000503:physiopathology; D012894:Sleep Stages / Q000502:physiology*