Co-sleeping is a practice in which babies and young children sleep close to one or both parents, as opposed to in a separate room. Co-sleeping individuals sleep in sensory proximity to one another, where the individual senses the presence of others. This sensory proximity can either be triggered by touch, smell, taste, or noise. Therefore, the individuals can be a few centimeters away or on the other side of the room and still have an effect on the other. It is standard practice in many parts of the world, and is practiced by a significant minority in countries where cribs are also used. Bed-sharing, a practice in which babies and young children sleep in the same bed with one or both parents, is a subset of co-sleeping. Co-bedding refers to infants (typically twins or higher-order multiples) sharing the same bed. There are conflicting views on bed-sharing safety and health compared to using a separate infant bed. The American Academy of Pediatrics does encourage room-sharing (sleeping in the same room but on separate surfaces) in its policy statement regarding SIDS prevention, but it recommends against bed-sharing with infants. Recent legal rulings suggest that bed-sharing has been attributed as a factor of unintentional infant suffocation. For instance, parents under the influence of drugs or alcohol and whose children died while bed-sharing have been charged and, at times, prosecuted with manslaughter in several US states (including Minnesota, Michigan, Georgia, Pennsylvania, Texas, Wisconsin and Utah). Bed-sharing is standard practice in many parts of the world outside of North America, Europe and Australia, and even in the latter areas a significant minority of children have shared a bed with their parents at some point in childhood. One 2006 study of children age 3–10 in India reported 93% of children bed-sharing while a 2006 study of children in Kentucky in the United States reported 15% of infants and toddlers 2 weeks to 2 years engage in bed-sharing. Bed-sharing was widely practiced in all areas up to the 19th century, until the advent of giving the child his or her own room and the crib. In many parts of the world, bed-sharing simply has the practical benefit of keeping the child warm at night. Bed-sharing has been relatively recently re-introduced into Western culture by practitioners of attachment parenting. Proponents hold that bed-sharing saves babies' lives (especially in conjunction with nursing), promotes bonding, enables the parents to get more sleep and facilitates breastfeeding. Older babies can breastfeed during the night without waking their mother. Opponents argue that co-sleeping is stressful for the child when they are not co-sleeping. They also cite concerns that a parent may smother the child or promote an unhealthy dependence of the child on the parent(s). In addition, they contend that this practice may interfere with the parents' own relationship, by reducing both communication and sexual intercourse at bedtime, and argue that modern-day bedding is not safe for co-bedding. Because children become accustomed to behaviors learned in early experiences, bed-sharing in infancy will also increase the likelihood of these children to crawl into their parent's bed in ages past infancy. Health care professionals disagree about bed-sharing techniques, effectiveness and ethics. The U.S. Consumer Product Safety Commission and the American Academy of Pediatrics strongly discourage bed-sharing because of the risk of suffocation or strangulation, but some pediatricians and breast-feeding advocates have opposed this position.