Circadian RhythmPeriodicityBiological ClocksSuprachiasmatic NucleusPeriod Circadian ProteinsCircadian Rhythm Signaling Peptides and ProteinsActivity CyclesSleep Disorders, Circadian RhythmPhotoperiodCircadian ClocksCLOCK ProteinsAlpha RhythmAtrial FibrillationARNTL Transcription FactorsChronobiology DisordersDarknessElectric CountershockLightElectrocardiographyMotor ActivityCryptochromesAnti-Arrhythmia AgentsBeta RhythmBody TemperatureSleepHeart RateJet Lag SyndromeDelta RhythmTime FactorsHeart Conduction SystemArrhythmias, CardiacCatheter AblationAccelerated Idioventricular RhythmHeart AtriaCardiac Pacing, ArtificialChronobiology PhenomenaAtrial FlutterElectroencephalographyWakefulnessOscillometryNeuronsAction PotentialsAmiodaroneNerve NetHeart BlockNuclear Receptor Subfamily 1, Group D, Member 1LocomotionElectrophysiologic Techniques, CardiacArrhythmia, SinusFeeding BehaviorAtrioventricular NodeHydrocortisoneBehavior, AnimalElectrophysiologyLightingPacemaker, ArtificialTachycardia, SupraventricularRespirationSinoatrial NodeAtrial Function, LeftGanglia, InvertebrateElectrocardiography, AmbulatoryDrug ChronotherapyMedulla OblongataCardiac Complexes, PrematureCasein Kinase IepsilonCorticosteroneRespiratory MechanicsArylalkylamine N-AcetyltransferasePulmonary VeinsHeart ArrestPhototherapyTelemetryFlavoproteinsAtrial FunctionMesocricetusTreatment OutcomeBody Surface Potential MappingChronotherapyTachycardia, VentricularDigoxinNeuropeptidesDrosophila ProteinsGene Expression RegulationAnimals, NewbornCardiopulmonary ResuscitationInhalationSeasonsAnalysis of VarianceModels, NeurologicalDefibrillatorsBrain StemTachycardia, ParoxysmalMoonSleep StagesSignal Processing, Computer-AssistedRats, Sprague-DawleyFourier AnalysisElectric StimulationReceptors, Melatonin