Вот канадские данные:Summary of the evidenceBased on the results of the case-control studies available, we can list the following evidence-based conclusions (Level II-2, Grade B evidence [Table 1]).    *      Sleeping on the back carries the lowest risk of SIDS (42,43).    *      Room-sharing lowers the risk of SIDS (24,35,37).    *      The risk of SIDS is increased when infants bedshare with mothers who smoke cigarettes (32,35,37).    *      Bedsharing with an adult who is extremely fatigued or impaired by alcohol or drugs (legal or illegal) that impair arousal can be hazardous to the infant (31,35,44,45).    *      The use of soft bedding, pillows and covers that can cover the head increase the risk of death in all sleeping environments (24,36).    *      Sleeping with an infant on a sofa is associated with a particularly high risk of sudden unexpected death in infancy (24,35).    *      An infant is more at risk of sudden unexpected death if he/she bedshares with people other than his/her parents or usual caregiver (24). ОТсюда:http://www.cps.ca/english/statements/cp/cp04-02.htm#Evidence