SleepSleep, REMSleep DisordersSleep Apnea, ObstructiveSleep Initiation and Maintenance DisordersSleep Apnea SyndromesPolysomnographyWakefulnessElectroencephalographyActigraphyArousalSleep Apnea, CentralCircadian RhythmDisorders of Excessive SomnolenceSleep BruxismSleep Disorders, IntrinsicQuestionnairesElectrooculographySleep Medicine SpecialtySleep Arousal DisordersSnoringNarcolepsyDelta RhythmDreamsSleep ParalysisTime FactorsREM Sleep Behavior DisorderNocturnal Myoclonus SyndromeCross-Sectional StudiesContinuous Positive Airway PressureElectromyographyRisk FactorsSeverity of Illness IndexPrevalenceFatigueHabitsHypnotics and SedativesMelatoninAnalysis of VarianceQuality of LifeCataplexySex FactorsComorbidityRestless Legs SyndromeProspective StudiesDepressionRespirationHealth StatusCohort StudiesSleep Phase ChronotherapyGeriatric AssessmentUnited StatesBody Mass IndexCase-Control StudiesHealth SurveysBody TemperatureSocioeconomic FactorsGreat BritainTreatment OutcomeActivities of Daily LivingLongitudinal StudiesFollow-Up StudiesMandibular AdvancementMotor ActivityHealthy People ProgramsChronic DiseaseSomnambulismSelf ReportAgingMonitoring, AmbulatoryBrainAdenoidectomyPharynxPsychomotor PerformanceHomeostasisObesityStress, PsychologicalTonsillectomyBrain WavesUvulaPonsCognitionPalate, SoftAustraliaActivity CyclesAzabicyclo CompoundsSex DistributionHealth Services for the AgedChronobiology DisordersAge DistributionCognition DisordersNeuropsychological TestsInterviews as TopicReproducibility of ResultsEnglandLogistic ModelsMemoryReference ValuesChinaIncidence