[pj1115]

I think you'd find some evidence for historical poverty being one factor of several in cultural practices of bed sharing. Japan would be a notable exception (plenty of co-sleeping, unremarkable poverty rate).

I also don't think it has become much less common in communities where poverty levels have fallen. Anecdotally, my SO is part of a community originally displaced from India and now settled all over the world, where members have disproportionately become very wealthy. Bed sharing is absolutely the norm in those households, much to my distress when we visit her family!

[Clewza313]

Not sure what you mean by Japan being an exception? Bed-sharing remains very much the default there.

[pj1115]

I was trying to say that this is common in Japan, where poverty is almost certainly not the major factor. A counter to the parent comment's assertion. Should have been clearer.