This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the Editor because of serious doubts regarding the data on melatonin levels. The authors used a melatonin ELISA kit that was not fit for purpose, resulting in data showing peak secretion of this hormone occurring in the middle of the light period, which does not make any physiological sense since melatonin is only produced during darkness.
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