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Upper panel: mean (+SEM) 24h norepinephrine urine concentrations at baseline and at 8th day of sleep restriction (group x condition: p= 0.009). Lower panels: mean (± SEM) norepinephrine levels during daytime and nighttime periods (normalized per hour) (group x condition: p=0.005). * p ≤ 0.05 vs. corresponding baseline.
