Circadian RhythmSleep Disorders, Circadian RhythmSuprachiasmatic NucleusPeriod Circadian ProteinsCircadian Rhythm Signaling Peptides and ProteinsCLOCK ProteinsBiological ClocksCircadian ClocksPhotoperiodARNTL Transcription FactorsChronobiology DisordersMelatoninActivity CyclesLightDarknessJet Lag SyndromeCryptochromesBody TemperatureSleepMotor ActivityPeriodicityPineal GlandNuclear Receptor Subfamily 1, Group D, Member 1PhototherapyCasein Kinase IepsilonChronotherapyLightingChronobiology PhenomenaFlavoproteinsTime FactorsWakefulnessHydrocortisoneArylalkylamine N-AcetyltransferaseBehavior, AnimalFeeding BehaviorDrug ChronotherapyReceptors, MelatoninMesocricetusHeart RateGene Expression RegulationRod OpsinsSeasonal Affective DisorderOscillometryWork Schedule ToleranceNuclear Receptor Subfamily 1, Group F, Member 1CorticosteroneDrosophila ProteinsLight Signal TransductionTranscription FactorsMice, Inbred C57BLModels, BiologicalDorsomedial Hypothalamic NucleusSleep DeprivationNuclear ProteinsFeedback, PhysiologicalPhotoreceptor Cells, InvertebrateRNA, MessengerBasic Helix-Loop-Helix Transcription FactorsSynechococcusOcular Physiological PhenomenaDyssomniasSalivaAlpha RhythmAtrial FibrillationTelemetrySleep StagesGanglionectomyEatingNeuronsLuciferasesNeuropeptidesCasein Kinase IdeltaMutationNeurospora crassaLocomotionPhotoreceptor CellsBrainE-Box ElementsMolecular Sequence DataPhodopusVasoactive Intestinal PeptideAnalysis of VarianceLuminescent MeasurementsDrosophilaBody Temperature RegulationAnimals, Genetically ModifiedSleep, REMCasein Kinase IDrosophila melanogasterSleep DisordersElectroencephalographyCell Cycle ProteinsLiverSolar ActivityAerospace MedicineCyanobacteriaFeedbackElectrocardiographyBlood PressureTemperature