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Introduction: Pregnancy is one of the most common background factors of sleep disorders. Sleep disorders can cause physical and psychological problems in pregnant women and may also cause some problems for fetus. This study was performed with aim to determine the relationship between sleep disorders during pregnancy with premature labor and low birth weight (LBW). Methods: This analytical cross-sectional study was performed in 2012 on 400 pregnant women at third trimester who continuously referred to the Ganjavian hospital in Dezful. Data collection tools were the questionnaire of demographic and obstetrics information and the standard questionnaires of Intensity Sleepiness Index, Sleepiness Scale, Pitisburgh Sleep Quality Index. Data were analyzed by SPSS software (version 19) and Chi-square test. P<0.05 was considered significant. Results: The frequency of sleep disorders at third trimester of pregnancy was 63% that significant relationship was found between sleep disorders at third trimester of pregnancy and preterm labor (p=0.038), but there was no significant relationship with LBW (p=0.617). Conclusion: There is a relationship between sleep disorders at third trimester of pregnancy and some undesirable outcomes of pregnancy such as preterm labor, so performing the needed measurements to treat sleep disorders can avoid these kinds of pregnancy outcomes.