Circadian RhythmSleep Disorders, Circadian RhythmSuprachiasmatic NucleusPeriod Circadian ProteinsCircadian Rhythm Signaling Peptides and ProteinsCLOCK ProteinsBiological ClocksCircadian ClocksPhotoperiodARNTL Transcription FactorsBehavior, AnimalChronobiology DisordersMelatoninFeeding BehaviorActivity CyclesLightDarknessJet Lag SyndromeCryptochromesMotor ActivityBody TemperatureSleepPeriodicitySocial BehaviorPineal GlandNuclear Receptor Subfamily 1, Group D, Member 1BehaviorHealth BehaviorPhototherapyCasein Kinase IepsilonTime FactorsSexual BehaviorChronotherapySexual Behavior, AnimalLightingChronobiology PhenomenaFlavoproteinsWakefulnessChild BehaviorHydrocortisoneExploratory BehaviorMaternal BehaviorAdolescent BehaviorArylalkylamine N-AcetyltransferaseModels, BiologicalDrug ChronotherapyChild Behavior DisordersCorticosteroneMesocricetusReceptors, MelatoninGene Expression RegulationBehavior TherapySeasonal Affective DisorderRod OpsinsDrosophila ProteinsOscillometryNeuronsHeart RateStereotyped BehaviorLocomotionWork Schedule ToleranceMice, Inbred C57BLNuclear Receptor Subfamily 1, Group F, Member 1Dorsomedial Hypothalamic NucleusAnalysis of VarianceLight Signal TransductionFeedback, PhysiologicalTranscription FactorsSleep DeprivationEatingPhotoreceptor Cells, InvertebrateDrinking BehaviorNuclear ProteinsNeuropeptidesBrainOcular Physiological PhenomenaTelemetryRNA, MessengerBasic Helix-Loop-Helix Transcription FactorsDyssomniasSynechococcusSalivaAlpha RhythmAggressionAgonistic BehaviorAtrial FibrillationRisk-TakingChoice BehaviorRats, Sprague-DawleySleep StagesMutationNesting BehaviorTemperatureGanglionectomyDrosophila melanogasterLuciferasesCasein Kinase IdeltaAnimals, Genetically ModifiedDrosophilaNeurospora crassa