You won’t find it, likely. Also, on the recommendation against co-sleeping, I went looking for the actual data. What I found was not SIDS related, but deaths from being squashed, and quite a few of them. I managed to find a few case studies, and they all included a parent under the influence (alcohol mostly in cars I found) and obese parents.

Regardless of how true it is, the establishment cannot make a recommendation of the “Co sleeping is ok if you don’t drink, not overweight, and a light sleeper” kind, as many of the people in those categories are in denial of being in those categories. so it will be “co sleeping is always dangerous”.