Figure 3.

Mean (± standard error of the mean) for subjective scales. (A) Samn-Perelli Fatigue Scale; (B) Karolinska Sleepiness Scale; (C) Self-Rated Performance Scale. Scales are reversed for presentation, with better ratings higher on the y-axis. Left-side panels display data per condition across preand post-nap testing points. Marker shading in the left-side panels matches column shading in the right-side panels for each condition. To assist the reader in clearly identifying the post-nap slopes for each group, the bars on the right simply represent the slope of the mean points as displayed in the left panel.