I'm having trouble finding a list of peer reviewed articles that talk about the damages of letting a baby cio. Can anyone help?
No CIO Resources
This article from Paediatric Respiratory Review: http://img2.timg.co.il/forums/1_147673444.pdf
From Notre Dame: http://www3.nd.edu/~jmckenn1/oldsite06/culturalarticle.html
This one is from the Dept of Psychology in the Netherlands that discusses the benefits of co-sleeping and cortisol regulation in infants: http://informahealthcare.com/doi/abs/10.3109/10253890.2012.742057?journalCode=sts
A lot of the research is not done in the US, but it is nonetheless peer reviewed. Just do a Google Scholar search on "co-sleep infants" or something similar. You will find a bunch from either side. You might need university library journal access for some of them though. :)