Circadian RhythmSleep Disorders, Circadian RhythmSuprachiasmatic NucleusPeriod Circadian ProteinsCircadian Rhythm Signaling Peptides and ProteinsCLOCK ProteinsPhotoperiodBiological ClocksCircadian ClocksARNTL Transcription FactorsMelatoninChronobiology DisordersDarknessLightActivity CyclesJet Lag SyndromeCryptochromesBody TemperatureSleepPeriodicityPineal GlandMotor ActivityNuclear Receptor Subfamily 1, Group D, Member 1HydrocortisonePhototherapyChronotherapyCasein Kinase IepsilonLightingWakefulnessTime FactorsSalivaFlavoproteinsFeeding BehaviorChronobiology PhenomenaDrug ChronotherapyBehavior, AnimalArylalkylamine N-AcetyltransferaseSeasonal Affective DisorderRod OpsinsReceptors, MelatoninCorticosteroneHeart RateTelemetrySleep DeprivationMesocricetusWork Schedule ToleranceGene Expression RegulationLight Signal TransductionOcular Physiological PhenomenaFeedback, PhysiologicalEatingPituitary-Adrenal SystemNuclear Receptor Subfamily 1, Group F, Member 1OscillometryTranscription FactorsRNA, MessengerPhotoreceptor Cells, InvertebrateDrosophila ProteinsBasic Helix-Loop-Helix Transcription FactorsHypothalamo-Hypophyseal SystemDorsomedial Hypothalamic NucleusNuclear ProteinsMice, Inbred C57BLModels, BiologicalSleep StagesSynechococcusNeuropeptidesDyssomniasPhotoreceptor CellsGene Expression Regulation, PlantAlpha RhythmAtrial FibrillationAdrenocorticotropic HormoneNeuronsSeasonsGanglionectomyBody Temperature RegulationAnalysis of VarianceLuciferasesCasein Kinase IdeltaArabidopsisBlood PressureSleep, REMMoonHypothalamusNeurospora crassaSleep DisordersTemperatureVasoactive Intestinal PeptideLiverMutationElectroencephalographyE-Box ElementsArabidopsis ProteinsLocomotionPhodopusCyanobacteriaIntraocular PressureRats, Sprague-DawleyEye Proteins