 In 1994, a number of organizations in the United States combined to further communicate these non-prone sleep position recommendations and this became formally known as the "Back To Sleep" campaign.In 1996 the AAP further refined its sleep position recommendation by stating that infants should only be placed to sleep in the supine position and not in the prone or lateral positions.In 1992, the first National Infant Sleep Position (NISP) Household Survey was conducted to determine the usual position in which U.S. mothers placed their babies to sleep