SleepSleep, REMSleep DisordersWakefulnessSleep DeprivationSleep StagesPolysomnographySleep Initiation and Maintenance DisordersCircadian RhythmDisorders of Excessive SomnolenceArousalElectroencephalographySleep Apnea, ObstructiveSleep Apnea SyndromesNight CareNight BlindnessTime FactorsActigraphySleep Apnea, CentralMelatoninElectrooculographySleep BruxismSleep Disorders, IntrinsicWork Schedule ToleranceDreamsSleep Arousal DisordersSnoringDelta RhythmContinuous Positive Airway PressureNocturnal Myoclonus SyndromeSleep Medicine SpecialtySleep ParalysisNight TerrorsNarcolepsyREM Sleep Behavior DisorderFatigueQuestionnairesHypnotics and SedativesElectromyographyHabitsDarknessPhotoperiodPersonnel Staffing and SchedulingSeverity of Illness IndexAnalysis of VarianceActivity CyclesBody TemperatureLightChronobiology DisordersLightingRespirationCataplexyCross-Over StudiesCross-Sectional StudiesRisk FactorsJet Lag SyndromeMonitoring, AmbulatorySuprachiasmatic NucleusAutomobile DrivingRestless Legs SyndromeTemazepamDouble-Blind Method