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Figure 1: Mean subjective assessment of sleepiness (+ and − SD) on the Karolinska Sleepiness Scale (KSS) during the working day following the experimental nights *Asterisk marks P levels <0.05

Figure 1: Mean subjective assessment of sleepiness (+ and − SD) on the Karolinska Sleepiness Scale (KSS) during the working day following the experimental nights
*Asterisk marks <i>P</i> levels <0.05