Conclusions
Overall, this study did not observe the effects of maternal sleep quality, sleep duration and nap duration on LBW and SGA, but found that insufficient sleep duration during pregnancy is an independent risk factor for PTB, and longer sleep duration may be associated with a lower risk of PTB. It is suggested that pregnancy health care providers should strengthen sleep problem care for pregnant women in order to reduce adverse birth outcomes.
Authors’ contributions
CL, HC, RW, XF and XS designed the study. CL, HC performed the statistical analysis and wrote the manuscript. CL, HC, SY, CZ, WH, YL, QL, ZS, ,RW, XF and XS contributed to the interpretation of the results and revision of the manuscript. CL, HC contributed equally to this work. All authors judged and reviewed the manuscript and approve the final version, and have obtained permission from RW, XF and XS corresponding authors before submission.