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. 2017 Oct 20;8:541. doi: 10.3389/fneur.2017.00541

Figure 2.

Figure 2

Cardiac modulation during sleep–wake transition. (A) Exposure to dawn stimulating light [dawn simulation light (DSL); gray lines] increases instantaneous heart rate (HR) relative to control dim light (black lines), and is associated with a higher cortisol increase. (B,C) DSL exposure (gray bars) progressively increases HR and relative cardiac sympathetic [LF/(LF + HF) ratio] levels during sleep-to-wakefulness, relative to control dim light (black bars). Horizontal lines: p < 0.05. Reproduced with permission from Viola et al. (82).