ArousalSleep Arousal DisordersBrain ChemistryBrain InjuriesBrain NeoplasmsBrain MappingSleepSleep StagesEroticaBrainElectroencephalographyPolysomnographyWakefulnessLibidoMagnetic Resonance ImagingBrain StemGalvanic Skin ResponseEmotionsHibernationBrain EdemaSleep, REMBrain IschemiaAffectCerebral CortexTime FactorsAnalysis of VarianceOrgasmBrain AbscessPhotoplethysmographyQuestionnairesCircadian RhythmCognitionSleep DeprivationPsychomotor PerformanceReaction TimeImage Processing, Computer-AssistedPhotic StimulationNeuronsHeart RateSleep Apnea, ObstructiveRats, Sprague-DawleySleep Apnea SyndromesNeuropeptidesHypoxia, BrainNeuropsychological TestsEuphoriaStress, PsychologicalSleep DisordersBlood-Brain BarrierElectrooculographySleep Initiation and Maintenance DisordersSexual Dysfunctions, PsychologicalRespiratory RateBehavior, AnimalSciuridaeBody TemperatureSomnambulismReproducibility of ResultsNeural PathwaysMemoryBrain Damage, ChronicAmygdalaNerve NetDouble-Blind MethodAcoustic StimulationAnxietyParasomniasOxygenBehaviorAgingBrain InfarctionHippocampusRespirationAutonomic Nervous SystemNocturnal Myoclonus SyndromeAttentionEstivationIndividualityPerceptionDose-Response Relationship, DrugElectromyographyBrain WavesCross-Over StudiesVisual PerceptionNerve Tissue ProteinsLocus CoeruleusHypothalamusCognition DisordersFunctional LateralityCuesSeverity of Illness IndexThalamusDeep Brain StimulationHypothalamic Area, LateralFrontal LobeCerebrovascular CirculationDisorders of Excessive SomnolenceRewardPersonal SatisfactionTreatment Outcome