The aim of the current study is to evaluate the effect of melatonin administration on circulating levels of inflammatory mediators, oxidative stress, sleep quality, fatigue and quality of life in patients with SLE. To the best of our knowledge, this is the first randomized-controlled trial to evaluate the impact of melatonin on sleep quality and assess fatigue and quality of life in SLE adult patients. Moreover, the impact of melatonin on serum concentrations of Interleukin-6 and superoxide dismutase SOD will be evaluated.