Lotker, Michelle. “Sunlight, Serotonin and Your Sleep Cycle.” PBS North Carolina, PBS North Carolina, 10 Aug. 2022, https://www.pbsnc.org/blogs/science/sunlight-happiness-link/#:~:text=And%20the%20good%20news%20is,or%20hot%20the%20weather%20was. 

Michigan State University

Lambert GW;Reid C;Kaye DM;Jennings GL;Esler MD; “Effect of Sunlight and Season on Serotonin Turnover in the Brain.” Lancet (London, England), U.S. National Library of Medicine, https://pubmed.ncbi.nlm.nih.gov/12480364/. 

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