Only modern economic progress in the US has made separate rooms and separate beds a standard. While I certainly grieve for this family, I also view this kind of occurrence the same way I view those incredibly rare malarial deaths in the US, a chilling reminder of how different (and more advanced) we are from the rest of the world. There but for the Grace of God...
I breastfed and frequently slept with all 4 of my babies for portions of many nights - we all survived just fine.
I suspect an important key to survival is to not be drunk.