Fig 1.
Flowchart of enrollment of pregnant women in the study.
Table 1.
Demographic factors among pregnant and non-pregnant women, self-reported data.
Table 2.
Sleep and light exposure variables for each weekday, and the association between pregnant and non-pregnant women.
Fig 2.
Daily sleep, in pregnant and non-pregnant women.
Estimated by linear mixed effects models including group-by-weekday interaction. The p value for time-by-group interaction was (A) p < .001 for Self-reported (SR) total sleep time (TST), (B) p = .192 for Self-reported sleep efficiency (SE), (C) p < .001 for Self-reported midpoint of sleep (MPS) was, (D) p = .183 derived from actigraphy (AW) for total sleep time (TST), (E) p = .027 derived from actigraphy for sleep efficiency (SE), (F) p = .408 derived from actigraphy for midpoint of sleep.
Fig 3.
Daily evening light exposure, in pregnant and non-pregnant women.
Estimated by linear mixed effects models including group-by-weekday interaction. The p value for time-by-group interaction was p = .307 derived from actigraphy for total white light (log transformed).
Table 3.
Association between sleep and different types of perceived stressors in pregnant women.
Table 4.
Association between sleep and evening light exposure in pregnant women.