Circadian RhythmSleep Disorders, Circadian RhythmSuprachiasmatic NucleusPeriod Circadian ProteinsCircadian Rhythm Signaling Peptides and ProteinsCLOCK ProteinsBiological ClocksCircadian ClocksPhotoperiodARNTL Transcription FactorsChronobiology DisordersMelatoninActivity CyclesJet Lag SyndromeLightDarknessCryptochromesBody TemperatureSleepPeriodicityMotor ActivityNuclear Receptor Subfamily 1, Group D, Member 1Pineal GlandPhototherapyCasein Kinase IepsilonChronotherapyLightingChronobiology PhenomenaFlavoproteinsWakefulnessHydrocortisoneArylalkylamine N-AcetyltransferaseTime FactorsDrug ChronotherapyFeeding BehaviorBehavior, AnimalReceptors, MelatoninSeasonal Affective DisorderMesocricetusRod OpsinsWork Schedule ToleranceNuclear Receptor Subfamily 1, Group F, Member 1Gene Expression RegulationOscillometryHeart RateCorticosteroneLight Signal TransductionDrosophila ProteinsDorsomedial Hypothalamic NucleusSleep DeprivationTranscription FactorsSynechococcusPhotoreceptor Cells, InvertebrateFeedback, PhysiologicalNuclear ProteinsBasic Helix-Loop-Helix Transcription FactorsOcular Physiological PhenomenaDyssomniasAlpha RhythmAtrial FibrillationTelemetryModels, BiologicalMice, Inbred C57BLSalivaGanglionectomyRNA, MessengerSleep StagesLuciferasesCasein Kinase IdeltaNeuropeptidesEatingNeuronsNeurospora crassaPhotoreceptor CellsE-Box ElementsLocomotionPhodopusVasoactive Intestinal PeptideBody Temperature RegulationLuminescent MeasurementsCasein Kinase ISleep DisordersSleep, REMDrosophilaSolar ActivityCell Cycle ProteinsMutationCyanobacteriaAnimals, Genetically ModifiedDrosophila melanogasterAerospace MedicineFeedbackElectroencephalographyElectrocardiographyTemperatureElectric CountershockNeurosporaReceptor, Melatonin, MT2Gene Expression Regulation, PlantHypothalamus