Reticular FormationPonsThalamic NucleiIntralaminar Thalamic NucleiSleep, REMBrain StemThalamusCatsMicroinjectionsImmobility Response, TonicMicrodialysisVentral Thalamic NucleiCell NucleusNeuronsWakefulnessGABA-A Receptor AgonistsTegmentum MesencephaliMedulla OblongataElectric StimulationRats, Sprague-Dawleygamma-Aminobutyric AcidMediodorsal Thalamic NucleusSleepSubthalamusNeural PathwaysElectroencephalographyMidline Thalamic NucleiMuscimolReceptors, GABA-ACholinergic AgonistsNeuronal Tract-TracersArousalGABA AgonistsAcetylcholineSaccadesStilbamidinesNitroso CompoundsCarbacholGeniculate BodiesHorseradish PeroxidaseNeural InhibitionReceptors, N-AcetylglucosamineAfferent PathwaysLampreysReticulumOxadiazolesAxonal TransportAction PotentialsSpinal Cord