I am not against it, nor am I completely for it. My children as infants ( as well as my 4 month old now), have slept in my room in thier own bed which was right next to my bed ( touching my bed), because when my infants are new or young, I want them right there, so I can hear them for feedings, as well as I have always been afraid of sids and I felt if they were close to me then I could watch them through the night, and not have to keep getting up.. it made me feel at ease, also, with this new one, I have a 6yr old daughter that has mama hen syndrome, so by keeping the baby next to me, I can make sure that my daughter isnt "helping" in the middle of the night, once again for my own sanity and for the protection of "big" sister, But.. I have allowed my children to sleep in my bed, for me it started when me and my ex husband split up, my daughter was about almost 2 and I would wake to find her lying on the floor by my bed sleeping with her blanket, I think she had a fear that i was going to leave too.. So I told her if you wake up you can get in bed with mommy ( I didnt want my daughter sleeping on the floor), so from time to time she would get in bed with me, if she woke in the middle of the night, then it became the same with my son, if my children are sick I have let them sleep with me, so that I could watch them, if they have nightmares and wake up I do not tell them they cant, they are 6 and 4 now and from time to time they do, it doesnt bother me, I am a mom 24 hours a day sometimes they just need me. When they are infants I normally do not put them in bed with me, only for my fear of hurting them, suffocation ect.. But.. my infant now had rsv, she was really sick a few weeks ago, and I was battling a temp with her all night, I did put her inbetween me and my husband.. and she finally fell asleep, she hadnt slept hardly at all in 2 days and I was considering taking her to the hospital.. her temp had gone down and she was sleeping.. I left her there, and the three of us were able to sleep for 3 hours. So I guess I am a middle of the road person, I sometimes do co-sleep and sometimes I dont, but my children all have thier own beds and thier own rooms. Ive given you a few of my reasons hope this helps.