Participants will be recruited from maternity units in the Midlands and North of England (led by centres in Liverpool, Manchester, West Yorkshire and Birmingham). 291 women with a singleton late stillbirth without congenital abnormality will be interviewed by research midwives shortly after the birth. A control group of 580 women with ongoing pregnancies will be interviewed at a gestation group matched to that at which stillbirths occurred. These data will determine whether an intervention study should be considered. If there is a causal relationship between maternal sleep position and late stillbirth we estimate that upto 37% of late stillbirths might be prevented.