A recent study on Sids in England revealed that over half of the babies there who died from Sids were co-sleeping. That’s not all. It further suggests that the adult who was sleeping with the infant on the couch perhaps were also either drunk or under the influence of drugs. They have added this to the ever growing list of reasons why a baby would die from Sids.
All I know for sure is that my 2 year old nephew died from Sids sleeping alone in his crib. I believe my sister found him on his stomach, but he was a month short of his 2nd birthday and could and did turn over and reposition himself in his sleep. My sister did nothing wrong and did nothing to cause this.