Insights into maternal sleep: a large-scale longitudinal analysis of real-world wearable device data before, during, and after pregnancy.

19 , 20 Similar to our findings, Guo et al.’s smaller study using the Oura ring showed a decreasing trend in light sleep after 10 weeks of gestation, but lacked a prepregnancy or nonpregnant control group to assess that light sleep overall has increased above baseline.

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