Pietikäinen JT, et al. - In the longitudinal CHILD-SLEEP birth cohort in Finland, researchers appraised sleep and depressive symptoms, both prenatally (around gestational week 32) and postnatally (around 3 months after delivery). In this prospective study, the questionnaire was completed by 1,667 women during the prenatal period. Of these, 1,398 women also participated in the postnatal follow-up. Poor general sleep quality, tiredness during the day, short sleep ≤ 6 and ≤ 7 hours, sleep latency > 20 minutes, and sleep loss ≥ 2 hours were noted to be associated with postnatal depressiveness, after adjusting for main background characteristics and prenatal depressiveness (Center for Epidemiological Studies Depression Scale ≥ 10). Nearly all sleeping problems, except frequent night awakenings per week or severe sleepiness during the day, were correlated to concurrent postnatal depressiveness postnatally, after the adjustment for background characteristics. These findings thereby emphasize that in order to recognize women at enhanced risk for postnatal depressiveness, screening of maternal prenatal sleeping problems, even without depressive symptoms during pregnancy or lifetime is needed.