Dr. James J. McKenna is a professor of anthropology and the director of the Mother-Baby Behavioral Sleep Laboratory at the University of Notre Dame. He is a world-renowned expert on infant sleep -- particularly the practice of bed sharing in relation to breastfeeding. In our conversations, he shared his insights on co-sleeping and bi-phasic sleep patterns and offered tips for new parents.
You have been supportive of co-sleeping -- describe your research on this sleeping arrangement. In what populations is it common? What are the benefits of co-sleeping?