Atrioventricular NodeBundle of HisHeart BlockCircadian RhythmElectrocardiographyEscape ReactionPeriodicityBiological ClocksSuprachiasmatic NucleusPeriod Circadian ProteinsCircadian Rhythm Signaling Peptides and ProteinsActivity CyclesSleep Disorders, Circadian RhythmPhotoperiodCircadian ClocksCLOCK ProteinsAlpha RhythmAtrial FibrillationARNTL Transcription FactorsDarknessLightChronobiology DisordersElectric CountershockImmune EvasionMotor ActivityTime FactorsCryptochromesAnti-Arrhythmia AgentsBeta RhythmMutationBody TemperatureHeart RateSleepBehavior, AnimalArrhythmias, CardiacJet Lag SyndromeDelta RhythmHeart Conduction SystemLocomotionCatheter AblationMolecular Sequence DataAccelerated Idioventricular RhythmHelplessness, LearnedHeart AtriaNeuronsCardiac Pacing, ArtificialAction PotentialsT-Lymphocytes, CytotoxicChronobiology PhenomenaFeeding BehaviorAtrial FlutterElectroencephalographyGanglia, InvertebrateWakefulnessNerve NetOscillometryEpitopes, T-LymphocyteElectrophysiologyModels, BiologicalMice, Inbred C57BLAmiodaroneAmino Acid SequenceLightingHIV-1PhagosomesNuclear Receptor Subfamily 1, Group D, Member 1Electrophysiologic Techniques, CardiacArrhythmia, SinusPacemaker, ArtificialHydrocortisoneSinoatrial NodePredatory Behavior