The young of all land mammals sleep in close proximity to their mothers. During the millions of years of prehistoric times, human infants probably slept with their mothers. In traditional tribal cultures today, the practice of sleeping with infants is still quite common. However, in the technologically advanced cultures of North America and Europe, this practice has been largely abandoned in favor of cradles and cribs. In most homes, the infant does not even sleep in the same room as the parents.
When and why did the natural practice of sleeping with infants become lost in Western cultures? During the 13th century in Europe, the Catholic priests first began recommending that mothers stop sleeping with their infants.(1) Although the primary reason for this advice was probably the rise of patriarchy and the fear of too much feminine influence on infants (especially male infants), the reason given for this advice was the fear of smothering the infants, commonly known as overlaying. It is now believed that most of the cases of infant deaths during the Middle Ages were caused by illness or infanticide. When accidental smothering occurred, it was probably caused by parents who were under the influence of alcohol.
By the 14th and 15th centuries, the advice not to sleep with infants began to take effect, and cradles were commonplace items of furniture in most European homes with children.(2) The age at which infants were put to sleep in cradles for the night, rather than in their mothers arms, became gradually younger. After the industrial revolution in the 18th century, the notion of spoiling became widespread in industrialized countries, and mothers were warned not to hold their infants too much for fear of creating demanding monsters.
During the twentieth century, infants in technological societies became more separated from their mothers than ever before in the history of our species. More and more births took place in hospitals, and the hospital central nursery was invented to protect the infants from infections. From day one, babies were expected to sleep alone, away from their mothers. The decline in breastfeeding, promoted by companies producing breast milk substitutes, further contributed to this separation of mothers from infants. During breastfeeding, mothers normally produce hormones (such as oxytocin and prolactin), which help create a strong desire to be physically close to their babies. Bottle-feeding deprives mothers of the hormones and eliminates the need for the biological mothers physical presence. The result of all these influences is that, by 1950, very few babies in Western, industrialized nations slept with their mothers.
It is little wonder that parents began seeking advice for a whole new array of problems. Experts in the field of child rearing found themselves searching for remedies for the babies who would not go to sleep at night, for those who banged their heads, for toddlers who climbed out of their cribs and kept coming into their parents bed, and for the young children who wet their beds, or had nightmares and fears of the dark. Many of these sleep-related problems could be the result of forcing babies to sleep alone.
Could it be that the increasing prevalence of teen sexuality and pregnancy reflects a need to be held more than a desire for sex? The expression to sleep with someone, implies to have sex. Perhaps this expression reflects a universal, unfilled childhood need to sleep next to ones parents and to be held during the night.
Fortunately, the practice of sleeping with infants and young children is becoming more widely recommended and accepted in Western, industrialized nations, as parents begin to trust their natural inclinations to share their beds with their infants. Starting in the 1970s a few books began to recommend that parents sleep with their babies. There are now many books that recommend bed sharing, commonly known as co-sleeping.(3)
Babies have strong attachment needs that researchers are just beginning to understand. The need for close physical contact, both during the day and at night, is a vital and legitimate need during the first few years. Anna Freud, the daughter of Sigmund Freud, recognized this when she wrote: It is a primitive need of the child to have close and warm contact with another persons body while falling asleep.... The infants biological need for the caretaking adults constant presence is disregarded in our Western culture, and children are exposed to long hours of solitude owing to the misconception that it is healthy for the young to sleep ... alone.(4)
Some child-rearing specialists state that babies will never want to leave once they have been taken into their parents bed. This may be true during the first few years when children need the closeness and security. However, we do not need to force children to become independent. This occurs of its own accord when children outgrow their early needs.
The strong desire of human babies to sleep near their mothers may have its basis in our evolutionary history. During the hunter-gatherer stage of our species existence babies would have been extremely vulnerable to predators and cold weather, especially at night. Infants who feared the dark and who refused to sleep alone had a much better chance of surviving than those infants who did not complain when put down. So there was strong selective pressure in favor of such fears.(5) Although predators are no longer a threat, and we have heated homes, modern human infants reflexes, instincts, and needs are still geared to the hunter-gatherer way of life. Cultural changes have occurred much too rapidly to have any major impact on the genetic makeup of our species since that time...
Researchers have studied the sleep patterns and brain waves of infants who share a bed with their mothers, compared with those of infants who sleep alone. Infants who sleep with their mothers have more brief awakenings, and also spend less time in deep sleep than solitary-sleeping infants. This is probably because of the mothers sounds and movements during her own sleep.(6)
This nighttime stimulation has been proposed as a possible protection against sudden infant death syndrome (SIDS). One theory of SIDS is that the infants are sleeping so soundly that they are unable to arouse themselves and continue breathing during a long breath-holding episode (apnea).(7) Cross-cultural studies have shown that, in cultures where infants are held regularly and where mothers sleep with their infants, SIDS rates are low compared to those cultures where these practices are not followed.(8) The researchers do not claim that sleeping alone causes SIDS, but they do suggest that letting infants sleep with their mothers could be a protective factor for those infants who are at risk for dying of SIDS.
Sleeping with your baby may require time to adapt, but with a little perseverance, bed sharing can become enjoyable for everybody. However, if it does not work well for you to share your bed with your baby, then at least you can provide physical closeness until your baby falls asleep, and you can respond promptly when he awakens during the night.