Reticular FormationPonsSleep, REMImmobility Response, TonicMicrodialysisWakefulnessCatsGABA-A Receptor AgonistsTegmentum MesencephaliMicroinjectionsBrain StemMuscimolCholinergic AgonistsSaccadesSleepGABA AgonistsAcetylcholineArousalElectroencephalographyNitroso Compoundsgamma-Aminobutyric AcidMedulla OblongataCarbacholElectric StimulationNeuronsOxadiazolesRats, Sprague-DawleyMesencephalonEfferent PathwaysWheat Germ Agglutinin-Horseradish Peroxidase ConjugateConsummatory BehaviorNeuronal Tract-TracersReceptors, GABA-APedunculopontine Tegmental NucleusStomatognathic SystemNeural PathwaysThalamic NucleiIntralaminar Thalamic NucleiReticulumPhotomicrography