Sleep, REMSleepSleep DisordersSleep DeprivationREM Sleep Behavior DisorderWakefulnessPolysomnographySleep StagesSleep Initiation and Maintenance DisordersDreamsSleep Apnea SyndromesElectroencephalographyDisorders of Excessive SomnolenceSleep Apnea, ObstructiveTime FactorsNarcolepsyActigraphyArousalElectrooculographyPonsElectromyographyCircadian RhythmHabitsDyssomniasActivity CyclesPedunculopontine Tegmental NucleusCataplexyCross-Sectional StudiesQuestionnairesTegmentum MesencephaliSleep Disorders, Circadian RhythmREM Sleep ParasomniasRisk FactorsReticular FormationSleep-Wake Transition DisordersAnalysis of VarianceAge FactorsObesityDelta RhythmSleep Disorders, IntrinsicCohort StudiesBody Mass Index