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(Obstet Gynecol. 2016;128(5):964–971)Poor sleep in the late stages of pregnancy as well as in the early postpartum period is known to be associated with various problems. There are few sleep improvement interventions that are available although a well-known one is the Sleep Enhancement Training System. This training is a cognitive-behavioral intervention in which sound-enhanced audio programs are used to promote relaxation and reduce hyperarousal. The objective of this study was to analyze the feasibility and effectiveness of the Sleep Enhancement Training System for Pregnancy to help enhance sleep among pregnant women as their sleep becomes more disrupted during late pregnancy as well as in the early postpartum period.