Measurements of overnight performance changes.

<p>Immediate and Plateau improvement of OSA patients and healthy controls on the motor sequence learning task (MST). Performance is measured as correctly typed sequences per 30-second trial. There was a difference in off-line improvement over a night of sleep with the healthy controls showing significantly more initial improvement (<i>P</i> = 0.023) and plateau improvement (<i>P</i> = 0.017). Error bars represent standard errors of the mean (SEM).