It is almost fact that women do not sleep great throughout their pregnancy, but new research links premature birth to poor sleep quality in both early and late stages of pregnancy. Early pregnancy, in weeks 14 through 16, showed a 25% increase in premature births as reported by Michele L. Okun of the University of Pittsburgh. She also reported that in later stages of pregnancy the odds increased by 18%. The study included 166 pregnant women using self reporting questionnaires which included the Pittsburgh Sleep Quality Index. Interestingly enough sleep quality in the second trimester did not relate to premature birth.
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