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The mean self-state rating scores (across all distractor conditions) for sleepiness (solid circles), stress (open diamonds), happiness (open circles), smartphone usage (open squares) and communication (closed triangles), plotted for session times T1 (6am to 12 noon), T2 (12 noon to 6 pm) and T3 (6 pm to 6 am the following day). The vertical error bars show ± one standard error of the mean.
