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Wehr, T. A., Aeschbach, D., & Duncan, W. C. (2001). Evidence for a biological dawn and dusk in the human circadian timing system. J Physiology, 535(3), 937–951.
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Zeitzer, J. M., Dijk, D. - J., Kronauer, R. E., Brown, E. N., & Czeisler, C. A. (2000). Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression. The Journal of Physiology, 526(3), 695–702.
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Czeisler, C. A. (2013). Perspective: casting light on sleep deficiency. Nature, 497(7450), S13.
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Eisenstein, M. (2013). Chronobiology: stepping out of time. Nature, 497(7450), S10–2.
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Owens, B. (2013). Obesity: heavy sleepers. Nature, 497(7450), S8–9.
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