HeartHeart RateNight BlindnessNight CareHeart FailureHeart DiseasesHeart TransplantationHeart Defects, CongenitalCircadian RhythmFetal HeartSleepHeart ValvesWork Schedule ToleranceHeart AtriaHeart BlockSleep DeprivationTime FactorsSleep StagesMyocardiumHeart Arrest, InducedPolysomnographyHeart Function TestsMyocardial ContractionMelatoninMyocardial IschemiaWakefulnessMyocytes, CardiacHemodynamicsCoronary DiseaseRisk FactorsCardiac Output, LowVentricular Function, LeftNight TerrorsDarknessProspective StudiesHeart, ArtificialHeart Failure, SystolicPerfusionCardiomyopathy, DilatedCardiomegalyMyocardial InfarctionSleep DisordersSleep, REMPersonnel Staffing and SchedulingHeart InjuriesHeart Rate, FetalHeart SeptumEchocardiographyCardiotonic AgentsPhotoperiodSleep Initiation and Maintenance DisordersRheumatic Heart DiseaseStroke VolumeCardiomyopathiesMyocardial Reperfusion InjuryHeart ArrestFollow-Up StudiesTreatment OutcomeHeart Valve ProsthesisAutonomic Nervous SystemArousalLightVentricular Dysfunction, LeftAdrenergic beta-AntagonistsHeart Failure, DiastolicAmerican Heart AssociationDogsVentricular RemodelingChronic DiseaseOxygen ConsumptionLightingRats, Sprague-DawleyDouble-Blind MethodSleep Apnea SyndromesSympathetic Nervous SystemRats, WistarPineal GlandDisease Models, AnimalCardiac Pacing, ArtificialHeart Septal DefectsHypoplastic Left Heart SyndromeHeart NeoplasmsElectrocardiography, AmbulatoryExercise TestSuprachiasmatic NucleusNational Heart, Lung, and Blood Institute (U.S.)Natriuretic Peptide, BrainSeverity of Illness IndexVentricular PressureEye Diseases, HereditaryElectrooculographyCohort StudiesAge FactorsMoonModels, CardiovascularSleep Apnea, ObstructiveActigraphySystoleXerophthalmiaCross-Over Studies