Figures show 665 babies’ deaths over past five years in the U.K. were linked to bed-sharing with parents, reports The Guardian.

The deaths of more than two babies a week are linked to sleeping in the same bed as one or more parents, official figures show. Co-sleeping has been linked to 665 baby deaths over the past five years, according to Department for Education data.

Sharing a bed with a baby has been associated with sudden infant death syndrome (Sids), particularly when a parent has been drinking alcohol or smokes, although no causal link has been established. Figures obtained by the Mirror through a freedom of information request show there were 141 deaths linked to co-sleeping in 2017, 131 in 2016, 121 in 2015, 141 in 2014 and 131 in 2013.