Figure 5. Distribution of vigilance states over the 24-h light-dark cycle in high (HR), intermediate (IR), and low (LR) reactivity males from generation VII.

The relative amount of wakefulness, non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep are plotted in panel A, B and C, respectively. Data are given as means±SEM for HR and LR mice and as SEM-area for the IR mouse line. Statistical differences between the three lines are indicated by asterisks (KWH-tests, for details see text, p<0.05 *). The dark phase of the light-dark cycle is indicated by the shaded area.