Arrhythmias, CardiacChronobiology DisordersCircadian RhythmElectrocardiographyElectrocardiography, AmbulatoryHeart Conduction SystemAtrial FibrillationSleep DisordersPeriodicityBiological ClocksSuprachiasmatic NucleusSleep Disorders, Circadian RhythmPeriod Circadian ProteinsCircadian Rhythm Signaling Peptides and ProteinsActivity CyclesPhotoperiodCircadian ClocksCLOCK ProteinsAlpha RhythmSleepARNTL Transcription FactorsTime FactorsLightDarknessDyssomniasMotor ActivityElectric CountershockMenstruation DisturbancesHeart RateAnti-Arrhythmia AgentsBody TemperatureSleep Initiation and Maintenance DisordersCryptochromesBeta RhythmElectroencephalographyWakefulnessSleep StagesDelta RhythmHeart BlockHuman ActivitiesEcosystemHeart AtriaJet Lag SyndromeCardiac Pacing, ArtificialBehavior, AnimalCatheter AblationActigraphyPolysomnographyAccelerated Idioventricular RhythmNeuronsTreatment OutcomeBrainTreesHydrocortisoneFeeding BehaviorOscillometryAnalysis of VarianceNerve NetPacemaker, ArtificialAction PotentialsChronobiology PhenomenaRespirationAtrioventricular NodeAtrial FlutterFatigueLocomotionSleep Disorders, IntrinsicSleep, REMSleep DeprivationAmiodaroneProspective StudiesElectrophysiologyElectrophysiologic Techniques, CardiacFollow-Up StudiesModels, BiologicalLightingConservation of Natural Resources