A. Delayed rise of salivary cortisol until fourth sample (conclusion of the Performance phase). B. Salivary cortisol at the end of mpTSST stressor (Performance phase), after 10 min of Recovery, and after 20 min of Recovery. Nap arm, N=15, Wake Arm N= 13. Error bars represent standard error of the mean. * p < 0.05, paired t-test.