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Robillard, R. et al. Parallel changes in mood and melatonin rhythm following an adjunctive multimodal chronobiological intervention with agomelatine in people with depression; a proof of concept open label study. Front. Psychiatry 9, 624 (2018). Knapen, S. E. et al. Social jetlag and depression status: results obtained from the Netherlands Study of Depression and Anxiety. Chronobiol. Inter 35, 1–7 (2018).

Castro, J. P. M. V. et al. Effects of long-term continuous exposure to light on memory and anxiety in mice. Physiol. Behav. 86, 218–223 (2005). Bedrosian, T. A. & Nelson, R. J. Timing of light exposure affects mood and brain circuits. Transl. Psychiatry 7, e1017 (2017).Adam EK, Quinn ME, Tavernier R, McQuillan MT, Dahlke KA, Gilbert KE (September 2017). "Diurnal cortisol slopes and mental and physical health outcomes: A systematic review and meta-analysis". Psychoneuroendocrinology. 83: 25–41. doi: 10.1016/j.psyneuen.2017.05.018. PMC 5568897. PMID 28578301. Moon, H. J., Lee, S. H., Lee, H. S., Lee, K. J. & Kim, J. J. The association between shift work and depression in hotel workers. Ann. Occup. Environ. Med. 27, 29 (2015). Norwegian researchers at the University of Tromsø have shown that some Arctic animals (e.g., ptarmigan, reindeer) show circadian rhythms only in the parts of the year that have daily sunrises and sunsets. In one study of reindeer, animals at 70 degrees North showed circadian rhythms in the autumn, winter and spring, but not in the summer. Reindeer on Svalbard at 78 degrees North showed such rhythms only in autumn and spring. The researchers suspect that other Arctic animals as well may not show circadian rhythms in the constant light of summer and the constant dark of winter. [53] Halberg F, Cornélissen G, Katinas G, Syutkina EV, Sothern RB, Zaslavskaya R, etal. (October 2003). "Transdisciplinary unifying implications of circadian findings in the 1950s". Journal of Circadian Rhythms. 1 (1): 2. doi: 10.1186/1740-3391-1-2. PMC 317388. PMID 14728726. Eventually I reverted, for the same reason, to "circadian" ... After breakfast, the brain is primed for learning and problem solving in the first half of the day. In the afternoon, we feel healthy if we have accomplished enough work to feel satisfied with our efforts. Without a good night’s sleep, you have an overwhelming feeling that you are wasting the day. As time passes, muscle tone peaks. And as evening comes, body temperature drops, and the production of melatonin (sleep hormone) rises – and the body prepares for sleep.

a b Masri S, Sassone-Corsi P (December 2018). "The emerging link between cancer, metabolism, and circadian rhythms". Nature Medicine. 24 (12): 1795–1803. doi: 10.1038/s41591-018-0271-8. PMC 6535395. PMID 30523327. Vitaterna MH, Takahashi JS, Turek FW (2001). "Overview of circadian rhythms". Alcohol Research & Health. 25 (2): 85–93. PMC 6707128. PMID 11584554. Lighting requirements for circadian regulation are not simply the same as those for vision; planning of indoor lighting in offices and institutions is beginning to take this into account. [121] Animal studies on the effects of light in laboratory conditions have until recently considered light intensity ( irradiance) but not color, which can be shown to "act as an essential regulator of biological timing in more natural settings". [122] Bonmati-Carrion, M. A., Baño-Otalora, B., Madrid, J. A. & Rol, M. A. Light color importance for circadian entrainment in a diurnal ( Octodon degus) and a nocturnal (Rattus norvegicus) rodent. Sci. Rep. 7, 8846 (2017).Borniger, J. C., Weil, Z. M., Zhang, N. & Nelson, R. J. Dim light at night does not disrupt timing or quality of sleep in mice. Chronobiol. Int. 30, 1016–1023 (2013). Chicago style: The Free Library. S.v. The Circadian Code.." Retrieved Nov 26 2023 from https://www.thefreelibrary.com/The+Circadian+Code.-a0583380849