SleepSleep, REMBirdsSleep DisordersSleep Apnea, ObstructivePolysomnographyWakefulnessSleep Apnea SyndromesSleep Initiation and Maintenance DisordersREM Sleep Behavior DisorderElectroencephalographyArousalDreamsElectrooculographyNarcolepsySleep StagesCircadian RhythmPasseriformesSongbirdsAnimal MigrationActigraphySleep Apnea, CentralDisorders of Excessive SomnolenceSleep Disorders, IntrinsicElectromyographySleep BruxismSleep ParalysisPonsFeathersDelta RhythmCharadriiformesSleep Medicine SpecialtyTime FactorsCataplexySnoringFlight, AnimalNocturnal Myoclonus SyndromeSleep Arousal DisordersPsittaciformesAnimals, WildREM Sleep ParasomniasSleep DeprivationContinuous Positive Airway PressureParrotsChickensMelatoninAnseriformesRaptorsGalliformesVocalization, AnimalAnalysis of VarianceNesting BehaviorFalconiformesQuestionnairesSparrowsFinchesHypnotics and SedativesBeakTegmentum MesencephaliSeverity of Illness IndexBehavior, AnimalBody TemperatureRespirationReticular FormationFatigueColumbidaeHabitsGeeseDucksActivity CyclesCloacaBird Fancier's LungPoultry DiseasesRestless Legs SyndromeSleep-Wake Transition DisordersSpecies SpecificityFeeding BehaviorOrexin ReceptorsBrain WavesPedunculopontine Tegmental NucleusBrainMonomeric GTP-Binding ProteinsCrowsPhylogenyHomeostasisSpheniscidaeTheta RhythmSeasonsSignal Processing, Computer-AssistedReptilesAzabicyclo CompoundsNeuropeptidesHaemosporidaReceptors, NeuropeptidePharyngeal MusclesMuscle HypotoniaSleep Phase ChronotherapyPoultryPalaeognathaeBiological Evolution