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Activation of cholinergic PPT neurons alters state-space characteristics of NREM sleep. Each dot represents EEG spectral characteristics of a 4 s epoch (n = 8 mice; see Materials and Methods). CNO reduces the amount of deep NREM sleep (gray dots) and increases the amount of light NREM sleep (black dots). CNO also reduces EEG total power. Histograms on the axes are overlapping.
