Childhood Bed-Sharing

I think humans evolved sleeping together, and that is especially so for infants and young children. It is only in recent times and almost only for economically well-off households that there is so much sleeping in separate beds (and even in separate rooms). In fact, in research I did using 19th century diaries, most people who mentioned their sleeping situation said that they shared a bed with other family members. Some even shared their bed with servants, farm hands, and visiting strangers who were passing through and needed to spend the night. So in evolutionary perspective, what might be strange is to grow up not sharing a bed.