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Pregnancy affects women's sleep in many ways. Physical and emotional difficulties, especially towards the end of pregnancy, can lead to sleep disorders. Several studies suggest associations between sleep quality and high blood pressure, diabetes and depression. Sleep deprivation affect both mother and fetus. Sleep disorders are associated with low birth weight, intrauterine growth restriction, premature birth and cesarean births. This paper is a review based on information from the literature. The analysis was limited to articles and guidelines in English published between January 1, 2000 and May 1, 2020 on PubMed, ScienceDirect and Google Scholar using the following keywords: sleep, pregnancy, depression, anxiety, mental health, sleep disorders, pregnant women, interventions, treatment. In this review, we discuss the characteristics of prenatal maternal sleep, hormonal changes during pregnancy and their effects on sleep, the effects of changing sleep patterns on the pregnant woman, and the interventions needed to optimize sleep quality. According to the literature, sleep disorders are significant risk factors for mood disorders. Knowing sleep changes and their effects is useful for informing mothers. Consideration of non-pharmacological treatments and interventions such as cognitive-behavioral therapy, mindfulness therapy and relaxation exercises can be effective in optimizing the quality of sleep in pregnant women.