Fig. 1.

Absolute correlations between RTS, PRK and day time sleep quality variables of Table 1. Sleep quality variables on x-axis are sorted following the order of Table 1. Dotted lines: Correlations considering PRK of five RK stages. Solid line: Correlations considering RTS of sleep microstates determined by the PSM. For each sleep quality variable a single microstate with the maximum absolute correlation was selected.