Figure 2

Amount and time course of vigilance states during 24 hours of baseline. A. Mean duration (± SEM, n = 6) of each vigilance state over the entire 24-hour baseline period. B. Time course of each vigilance state over the entire 24-hour baseline period. Values plotted as mean duration (± SEM, n = 6) of each state in 2-hour intervals. Inset shows the 24-hour time course of the ratio REM/SWS. C. Mean duration (± SEM, n = 6) of each vigilance state during the 10-hour light period (L) and the 14-hour dark period (D).