"By this route, information about the amount of light falling on the retina regulates the operation of the SCN, controlling circadian rhythms, including sleep and waking. " [L]ight affects our circadian rhythms more powerfully than any drug " (Czeisler, 2013, S13). The regularly repeating daily exposure to light and dark results in a stable sleepewake cycle, which is essential for mental and physical health (e.g., Alvarez & Ayas, 2004; Alvaro, Roberts, & Harris, 2013). "
"It has also been proposed that the use of electricity for light artificially shortens human exposure to nocturnal darkness, extends the active period, and leads to a consolidated bedtime and shorter sleep duration than would be observed in a natural light-dark cycle (Wehr, 1999). The use of electricity can disrupt circadian rhythms, and this could lead to increased sleep deficiency (Czeisler, 2013). Thus, individuals living in areas with limited or no access to electricity may exhibit different sleep-wake patterns than have been observed in industrialized countries. "
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