Some people believe that babies who co-sleep with their parents are more independent, more outgoing, and more confident as children. As adults, they have higher self-esteem, better stress-management skills, and are more comfortable with intimacy than adults who slept alone as babies. However, sleeping arrangements on their own cannot make your baby into a particular type of person.

The pros and cons of co-sleeping
http://www.babycentre.co.uk/baby/sleep/cosleepingpros&cons/