http://www.nd.edu/~jmckenn1/lab/overlaying.html
Finally, it is not a pleasant thought to consider, but I always think that it is important to consider if, by chance, an infants died from SIDS while sleeping next to you, would you assume that you suffocated the infant, or would you know that you did not, that the infant died independently of your presence? If you are unable to believe that a SIDS could occur independent in the bed-sharing or bed-sharing/breast feeding context, just as it can under perfectly safe solitary sleeping conditions, then perhaps it might be best to have the your infant cosleep next to you on a separate surface, rather than actually in your bed. Regardless of what you decide, it is important to consider the possibility, no matter how remote and unlikely such a scenario may be. That SIDS can, indeed, occur, where safe bed-sharing, breast feeding and complete nurturing and care for the infant has occurred, makes this question worth discussing amongst you and your partner.