Maternal depressive symptoms and mother-infant cosleeping (including room sharing and bedsharing): a systematic review

Study Objectives: Maternal depressive symptoms (MDS) affect most women during the first year postpartum. Mothers provide most of the nighttime care for infants, so studying the relationship between MDS and infant sleep location (ISL) is highly relevant to understanding maternal mental health over the first year of life and beyond. Infant sleep is studied by anthropologists, health care providers, and psychologists, with very little communication across disciplines. This review aimed to determine whether there is a predictive relationship between MDS and ISL. Methods: This systematic review searched 6 databases with terms related to maternal mood and ISL. Final analysis included 14 published studies, analyzed with narrative synthesis and Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Included studies directly compared ISL and MDS. Results: Five studies showed no relationship between ISL and MDS, and 1 study found bedsharing reduced MDS. Five studies found cosleeping was related to higher MDS although directionality is mixed or missing, and 3 studies found an association at some ages or for some populations only. Examining studies according to type of infant sleep assessment, study design, age of infant, or breastfeeding status failed to detect consistent patterns. Conclusions: A variety of study designs, types and definitions of variable measures, sample recruitment, and study outcomes prevent detection of a consistent relationship between MDS and ISL. We explore reasons for the elusive nature of a relationship and make recommendations for future research in MDS and ISL, including crossdisciplinary collaborations.