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Scatterplots for change in psychomotor vigilance task-B response speed at first wake-up test point (+2 min) compared to pre-nap against total sleep (left panel) and SWS (right panel). Trend lines are shown for each condition (10-NAP: striped circles, dashed lines; 30-NAP: white circles, solid lines). SWS, slow wave sleep; TST, total sleep time.
