For a good and recent systematic review of bedsharing studies examining both 
harms and benefits attributed to bedsharing, see:
Horsley et al (2007) Benefits and Harms Associated With the Practice of Bed 
Sharing: A Systematic Review. Arch Pediatr Adolesc Med. 161(3):237-245. 

The abstract of this article (and full access for those with appropriate 
subscriptions) can be found here:
http://archpedi.ama-assn.org/cgi/content/abstract/161/3/237

Fo a comprehensive summary of the research on bedsharing conducted in the 
1990s by Jim McKenna, Sarah Mosko and colleagues, and the more recent 
research conducted by those of us who have followed in their footsteps, see:

McKenna, JJ. Ball HL, Gettler LT. Mother-infant cosleeping, breastfeeding and 
sudden infant death syndrome: what biological anthropology has discovered 
about normal infant sleep and pediatric sleep medicine. Am J Phys Anthropol. 
2007;Suppl 45:133-61

The abstract of this article (and full access etc etc) can be found here:
http://www3.interscience.wiley.com/journal/117353127/abstract

Regards,
Helen Ball, Professor of Anthropology, Director, Parent-Infant Sleep Lab, 
Durham University, UK.
www.dur.ac.uk/sleep.lab

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