Sleep disruption during pregnancy is often dismissed as inevitable, but understanding whether poor sleep is a transient phase or a persistent condition fundamentally changes how clinicians should screen and intervene. This longitudinal study identifies distinct sleep phenotypes across the entire perinatal window — a distinction that matters because sustained poor sleep, not just occasional disruption, is what drives adverse maternal and fetal outcomes.
Drawing on 1,210 Chinese women tracked at seven time points from the first trimester through six weeks postpartum, researchers used growth mixture modeling to distinguish three trajectory groups. The largest cluster — 57.6% of participants — maintained consistently good sleep throughout. A striking 40.9% fell into a "stable-poor" group, meaning their sleep quality was poor at enrollment and remained poor across all subsequent assessments, including postpartum. A small third group (1.5%) began with severely disrupted sleep that improved over time. Early first-trimester sleep quality was the strongest predictor of trajectory membership, carrying nearly an eightfold greater risk of belonging to the stable-poor group. Pregnancy-related psychological stress and anxiety at baseline also independently elevated risk, by roughly 49% and 78% respectively. Notably, depression — often assumed to be the dominant driver of perinatal sleep problems — lost statistical significance once stress and anxiety were accounted for in multivariate modeling.
This finding reframes the clinical picture in a meaningful way. It suggests that anxiety and pregnancy-specific stress, rather than depressive symptomatology, may be the more proximal mediators of chronic perinatal sleep disruption — a distinction with direct implications for targeted interventions. The study's primary limitation is its Chinese multicenter sample, which limits generalizability given cultural, occupational, and healthcare context differences. The observational design also precludes causal inference. Still, the identification of a large, stable-poor trajectory group beginning in early pregnancy supports the case for universal sleep screening at the first prenatal visit, with particular attention to anxiety and perceived stress as modifiable targets.
