Co-sleeping
- Nina G
- 4 days ago
- 4 min read
The decision whether to cosleep with your baby is extremely controversial—and there are two sides to the story.
Few parenting conversations in early childhood elicit as much angst and judgment as the one about our children’s sleep: Where should they sleep, and how do we get them to sleep through the night? We label newborn babies as “good,” or not, depending on how much they disturb us in the nighttime, or we believe babies’ sleep is a reflection of our parenting competence.
But our beliefs and decisions about children’s sleep are more a reflection of the culture we live in than the scientific evidence for what’s best for children
The psychological benefits of cosleeping
Anthropologists observed that all mammals and primates, as well as the majority of non-Western societies around the world, coslept. Therefore, it was likely that the practice had some biological advantage.
When parents and babies sleep together, their heart rates, brain waves, sleep states, oxygen levels, temperature, and breathing influence one another.
To a biological anthropologist, this mutual influence implies that the offspring’s growth is intended to occur most safely inside that biological system, near an adult’s body, especially in the first few months of life while the baby’s own physiology is the most immature.
For example, animal studies found that when baby monkeys were separated from their mothers, their bodies went into severe stress.
A small study of 25 four- to ten-month-old babies who were separated for sleep training showed that even though the babies’ behavior quieted on the third night, their levels of cortisol (a stress hormone) remained high.
When adults and babies sleep together, McKenna and his colleagues found, they do sleep more lightly and rouse more often
Though that might sound undesirable, it is safer, says McKenna, especially in the first few months of life, because it creates more opportunities for caregivers to check on their babies and for babies to recalibrate their breathing to the adult’s breathing
For an added benefit, that lighter sleep, or REM (Rapid Eye Movement) sleep, is also important for synaptogenesis, the rapid growth of connections between neurons, in newborns.
At the same time, both adults and babies sleep longer overall when they bedshare, probably because caregivers don’t have to get all the way up out of bed to feed and babies don’t have to call out, wait for help, and settle back down.
Research suggests that more well-rested parents make better decisions and, importantly, have better emotion regulation.
Sleep deprivation also raises the risk of postpartum depression.
One study found that when fathers slept close to their babies, their testosterone dropped more compared to fathers who slept separately.
Men with lower testosterone tend to engage in more sensitive and responsive parenting, which means that bedsharing may make for better fathering.
Families who choose to cosleep beyond infancy but worry it makes children overly dependent can relax.
On average, children who bedshare do tend to transition to sleeping independently about a year later than other children, but they may be more independent, self-reliant, and confident in their daily lives than children who did not bedshare.
A small 2004 study of 83 preschoolers found that children who slept alone from an early age fell asleep more on their own and slept more through the night
the preschoolers who coslept from an early age were more likely to dress themselves, entertain themselves, and work out problems with peers on their own.
Another 2002 study of 205 families showed that by age 18, children who bedshared did not differ from solitary sleepers in their sleep problems or mental health. In other words, as children grow, many different factors contribute to their well-being.
How did sleep become so controversial?
For most of human history, McKenna writes, parents slept close to their babies for their safety and protection, as well as for parents’ own ease of breastfeeding and sleeping.
The particular arrangements varied—some parents slept nestled with their babies on the same bed, mat, or rug; others placed their babies in a hammock or basket within arms’ reach; still others placed them in a “sidecar” arrangement next to the adult bed.
About 500 years ago, Western societies diverged from the rest of the world regarding family sleep
Historical records from northern Europe show that Catholic priests heard confessions from destitute women who had “overlain” onto their newborns, suffocating them in a desperate attempt to limit their family size—they just couldn’t support another child. So the church ordered that babies should sleep in a separate cradle until the age of three.
Over time, other Western trends converged with that decree: Rising affluence and the value on independence and individualism made separate bedrooms fashionable
In addition, Freudian psychology privileged the marriage bed and claimed that babies would be harmed if they were exposed to parents’ sexuality.
Religious and psychological opinion said that children should not be coddled or indulged but required severe discipline to grow up (“spare the rod, spoil the child”).
As recently as the 1960s, the kindly Dr. Spock recommended that newborns be trained to sleep alone, and if the baby’s crying stressed the parents, they should place a towel under the door to block out the noise.
In the 1990s, parents “Ferberized” their babies—letting them “cry it out” to sleep “independently,” based on the book Solve Your Child’s Sleep Problems by Richard Ferber.
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