Не задохнётся, если не класть на подушки и не укрывать одеялами. В принципе не понимаю, как может быть опасно, если мать чувствует каждое движение ребёнка. Кстати совместный сон уменьшает риск СИДС. Потом, есть специальное приспособление для ребёнка, которое кладётся в кровать (типа "бортиков" ), чтобы ребёнок был немного отгорожен от родителей. А вообще вот нагуглилаAdvantagesOne study reported mothers getting more sleep by co-sleeping and breastfeeding than by other arrangements.[9]It has been argued that co-sleeping evolved over five million years, that it alters the infant's sleep experience and the number of maternal inspections of the infant, and that it provides a beginning point for considering possibly unconventional ways of helping reduce the risk of sudden infant death syndrome (SIDS).[10][11]Stress hormones are lower in mothers and babies who co-sleep, specifically the balance of the stress hormone cortisol, the control of which is essential for a baby's healthy growth.[12][13][14][15]In studies with animals, infants who stayed close to their mothers had higher levels of growth hormones and enzymes necessary for brain and heart growth.[16][17]The physiology of co-sleeping babies is more stable, including more stable temperatures, more regular heart rhythms, and fewer long pauses in breathing than babies who sleep alone.[18][19]Co-sleeping may promote long-term emotional health. In long-term follow-up studies of infants who slept with their parents and those who slept alone, the children who co-slept were happier, less anxious, had higher self-esteem, were less likely to be afraid of sleep, had fewer behavioral problems, tended to be more comfortable with intimacy, and were generally more independent as adults.[20][21][22][23] However, a recent study (see below under precautions) found different results if co-sleeping was initiated only after nighttime awakenings. Co-sleeping from birth or soon afterwards is the norm except in some Western cultures.[edit] PrecautionsCo-bedding is known to be dangerous for any child when a parent smokes, but there are other risk factors as well.[6] Some common advice given is to keep a baby on its back, not its stomach, that a child should never sleep with a parent who smokes, is taking drugs (including alcohol) that impede alertness, or is obese.[24] It is also recommended that the bed should be firm, and should not be a waterbed or couch; and that heavy quilts, comforters, and pillows should not be used. Young children should never sleep next to babies under nine months of age.[25] It is often recommended that a baby should never be left unattended in an adult bed even if the bed surface itself is no more dangerous than a crib surface. There is also the risk of the baby falling to a hard floor. Parents who roll over during their sleep could inadvertently crush and/or suffocate their child, especially if they are heavy sleepers and/or obese.A recent report explored the relationship between ad hoc parental behaviors similar to traditional co-sleeping methodology, though the study's subjects typically utilized cribs and other paraphernalia counter to co-sleeping models. While babies who had been exposed to behaviors reminiscent of co-sleeping had significant problems with sleep later in life, the study concluded that the parental behaviors were a reaction to already-present sleep difficulties. Most relationships between parental behavior and sleeping trouble were not statistically significant when controlled for those preexisting conditions. Further, typical co-sleeping parental behavior, like maternal presence at onset of sleep, were found to be protective factors against sleep problems.[26]