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Time course of the EEG power density in the low-range (0.5-1.5 Hz) SWA in NREM sleep during baseline (controls, n = 27; NA depleted, n = 16). Curves connect 2 h mean values (±SEM) of SWA expressed for every individual animal as a percentage of the 24 h baseline mean (100%). Triangles indicate differences between the two experimental groups (p < 0.05; two-tailed unpaired t test after significance in two-way ANOVA).
