Chronobiology DisordersCircadian RhythmSleep Disorders, Circadian RhythmArrhythmias, CardiacHeartHeart Conduction SystemMelatoninElectrocardiographyHeart RateDefibrillators, ImplantableEuropeAtrial FibrillationPacemaker, ArtificialCardiologySocieties, MedicalFractalsElectrocardiography, AmbulatoryCardiac Imaging TechniquesCardiac Pacing, ArtificialElectric CountershockCatheter AblationAnti-Arrhythmia AgentsBipolar DisorderDevice RemovalHeart FailureSignal Processing, Computer-AssistedMental DisordersMood DisordersAnxiety DisordersHealth Care SurveysHeart DiseasesCardiac Resynchronization TherapyTreatment OutcomeHeart Defects, CongenitalHeart TransplantationDeath, Sudden, CardiacTachycardia, VentricularDiagnostic and Statistical Manual of Mental DisordersRisk FactorsPractice Guidelines as TopicHeart AtriaFetal HeartPhysician's Practice PatternsPeriodicityBiological ClocksDepressive Disorder, MajorSuprachiasmatic NucleusHeart ValvesHeart BlockAttention Deficit Disorder with HyperactivityDepressive DisorderPeriod Circadian ProteinsTime FactorsCircadian Rhythm Signaling Peptides and ProteinsObsessive-Compulsive DisorderAutistic DisorderStress Disorders, Post-TraumaticActivity CyclesPhotoperiodPhobic DisordersPsychotic DisordersChild Development Disorders, PervasiveSubstance-Related DisordersCircadian ClocksMyocardiumCLOCK ProteinsAlpha RhythmMyocardial ContractionHeart Function TestsHeart Arrest, InducedConduct DisorderSleep DisordersTic DisordersARNTL Transcription FactorsPsychiatric Status Rating ScalesComorbidityMyocardial IschemiaFollow-Up StudiesMyocytes, CardiacProspective StudiesDisease Models, AnimalCognition DisordersHemodynamicsBorderline Personality DisorderHeart ArrestMotor ActivityChronic DiseaseSomatoform DisordersCoronary DiseaseSeverity of Illness IndexLightDarknessPrevalenceRats, Sprague-DawleyVentricular Function, LeftLymphoproliferative DisordersCase-Control StudiesEchocardiographyCardiomyopathy, DilatedSleep