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. 2015 Jun 1;38(6):979–988. doi: 10.5665/sleep.4754

Figure 4.

Figure 4

Time-course of sleep and waking under 12hL:12hD and 24h D:D. Vigilance states are represented as the amount of minutes per hour across 48-hours of the 12hL:12hD cycle (A) or 24h D:D (B). (C) Difference between the light and dark periods of total amounts of wake, non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep during the 12hL:12hD baseline condition (left), and difference of vigilance states between the subjective light and dark periods under 24h D:D (right). All values are expressed as mean ± standard error of the mean. A two-way ANOVA for time-course and light condition showed significance for any vigilance states between baseline and constant darkness (black points- one-way ANOVA for light condition, post hoc t test, P < 0.05). Asterisks denote significant differences (P < 0.05). CT, circadian time; D, dark; L, light.