Bed sharing in cross-cultural perspective
Throughout human history, babies and mothers have slept together, often sharing a sleep surface (Konner 1981). Is this a safe arrangement?
The answer depends on the details. The typical, Western-style bed is not a safe place for babies to sleep. And there are people whose habits make them dangerous bed partners.
But some sleeping arrangements are much safer than others. For instance, there may be little or no added risk associated with shared sleep as it has been practiced in traditional Japan. In fact, it might even be safer than solitary sleep.
More generally, bed sharing seems to be pretty safe for older babies. If you read the scientific and medical literature, the controversy about bed sharing safety primarily concerns babies less than 20 weeks old, and the most recent meta-analysis of published studies found no evidence of increased risk for babies over 3 months of age (Carpenter et al 2013).
Here I describe the specific circumstances that are linked with higher rates of mortality among young babies. In addition, I describe the arguments for and against sharing a bed. Last, I review what researchers agree about.
As noted below, most researchers agree that young babies should sleep in the same room where their parents sleep. The point of disagreement is whether parents should be advised against sharing their beds.
Some researchers think that the safest arrangement involves cosleeping without sharing the same bed--i.e., placing a young infant in a crib or “side car” that is within arm’s reach of his parent. But it's not yet clear if a stringent approach to sharing a sleep surface -- an approach that eliminates the hazards posed by Western beds and sleep habits -- is linked with any elevated risk.
Understanding the hazards of bed sharing with infants
Several organizations have issued recommendations against bed sharing for infants (e.g., the American Academy of Pediatrics). These organizations base their recommendations on Western studies linking bed sharing with increased SIDS rates for babies under 20 weeks old. In addition, babies who sleep in traditional, Western-style adult beds may be at greater risk of accidental injury or death.
Why? Much of the risk is associated with specific cultural practices.
Smoking and the risk of SIDS
There is something about smoking that makes bed sharing very dangerous. Studies suggest that the odds of SIDS, or sudden infant death syndrome, are much greater -- 16 to 100 times greater -- for babies who bed share with a mother or other adult who smokes. This pertains to both prenatal exposure--i.e., babies whose mothers smoked during pregnancy--and to postnatal exposure to household smoke (Horsley et al 2007; Carpenter et al 2013).
Why the link? That’s not yet clear. Research suggests that babies who are exposed to smoke have more difficulty arousing from sleep, perhaps because smoke exposure changes the serotonin pathways of the brain (Kinney 2009). And when babies having difficulty arousing, they are at increased risk for SIDS.
But regardless of the mechanism, there is a consensus that smokers shouldn’t bed share, and that smoking can explain much of the elevated SIDS risk associated with shared sleep.
In some studies, the risk of bed sharing became statistically insignificant after researchers controlled for maternal smoking (e.g., Scragg et al 1993; Blair et al 1999; McGarvey et al 2003). However, more recent studies suggest an elevated risk still exists among nonsmokers in Western populations (Carpenter et al 2013).
Dangerous sleeping surfaces
Sofas, chairs, and waterbeds are very dangerous places for babies to sleep. Indeed, an analysis of SIDS cases in Scotland found that the risk of mortality increased 60-fold for babies cosleeping on sofas (Tappin et al 2005).
Compared to a sofa, chair, or water bed, a conventional bed might seem less hazardous. But the typical Western bed wasn’t designed for babies, and it presents several dangers (Nakamura et al 1999; Kemp et al 2000).
• Western beds may include pillows, loose bedding, heavy blankets, duvets, or soft mattresses--all hazards for accidental suffocation, re-breathing asphyxia, and SIDS.
• Babies can get trapped in the spaces between a mattress and a wall, headboard, or footboard.
• Bed rails pose a strangulation hazard.
• Western beds are elevated from the floor, creating a falling hazard.
• Even a bed sheet or light blanket poses a risk if it can cover a baby’s face
This last point shouldn’t be overlooked, because research suggests that any kind of covering--even a thin bed sheet--can make it harder for babies to arouse from sleep (Franco et al 2002).
This suggests that the sleeping environment is safer when parents and babies sleep without any coverings at all. When people sleep under sheets or blankets, these coverings tend to end up over the baby's face.
A study mother-infant pairs in New Zealand found that bed sharing infants were far more likely than were solitary sleepers to spend time with blankets covering their noses, faces, or entire heads (Baddock et al 2006).
Unsafe sleeping companions
Let's imagine a sleeping surface that is firm and free of known hazards--like loose bedding and bed rails. What risks are posed by the presence of another person in bed?
Are babies at risk of being smothered?
Perhaps a parent's biggest fear is overlaying--i.e., a baby getting smothered because somebody accidentally rolls onto him during sleep. What percentage of bed sharing incidents end in this horrifying way?
Such accidents have been documented in the United States and elsewhere (e.g., Nakamura et al 1999; Kemp et al 2000; Shapiro-Medonza et al 2009). But because we lack information about the prevalence of bed sharing, it’s hard to quantify the risk.
There is evidence regarding the frequency of adults rolling over.
In a study by Sally Baddock and colleagues, 40 mother-infant pairs were videotaped and monitored as they slept together in their own homes on two consecutive nights. The researchers observed no instances in which the mother obstructed the baby’s airways. Nor did the babies experience any unusual changes in oxygen level or body temperature (Baddock et al 2006). Such findings are supported by the experiences of James McKenna, who has conducted decades of laboratory research on mother-infant bed-sharing.
Of course, this doesn’t mean that it never happens. A recent survey of bed-sharing mothers in Canada found that 13% of the respondents recalled at least one episode in which someone (e.g., the mother or father) had rolled onto or part way onto their infants (Ateah and Hamelin 2008).
In these cases, none of the infants were hurt. The sleeper was awakened before any injury occurred.
That’s probably normal--at least when the sleeper is a healthy mother unimpaired by drugs, alcohol or exhaustion. As James McKenna has argued, mothers and infants have slept together for millions of years. Natural selection would have favored traits that keep mothers attuned to their babies during sleep.
And research suggests that mothers who routinely bed-share are light sleepers.
In a laboratory study, mothers experienced 30% more arousals when they slept with their infants (Mosko et al 1997a). And mother-infant pairs tend to sleep in synchrony, with more than 70% of their arousals overlapping (Mosko et al 1997b). Moreover, mothers who bed-share check on their babies more frequently during the night. In Baddock’s study, bed sharing mothers checked on their babies a median of 11 times. For mothers sleeping in separate beds, the median was 4 (Baddock et al 2006).
Who should never bed share: High-risk groups
Presumably, at least some of the incidents reported in the Canadian study could have ended badly if people on the scene had been less alert. And indeed, case studies of SIDS and accidental death have linked higher mortality rates with certain kinds of bed-sharers.
For example, there is evidence that sharing a sleep surface is more dangerous for babies of low birth weight (low for gestational age or less than 2500 grams - McGarvey et al 2006).
Researchers also agree that children should not sleep with young babies.
• The risk of infant death is greatly increased when bed sharing parents have consumed alcohol or any other drugs or medications that impair alertness and judgment (Carpenter et al 2004; Blair et al 1999; McGarvey et al 2006). In the most recent meta-analysis of published studies, Robert Carpenter and colleagues found that the risk of SIDS increases dramatically for young babies when their mothers have consumed 2 units or more of alcohol in the previous 24 hours. For example, the odds for 2-week-babies increase almost 90-fold. And the increased risk of death for babies sharing beds with drug-using mothers was "unquantifiably large" (Carpenter et al 2013).
• Sleeping together is also more dangerous when parents are very tired (Blair et al 1999). Presumably, people sleep more deeply when they are overtired and might be less likely to awaken when their baby is in danger.
• It’s also about how many people are in the bed. In an analysis of SIDS deaths in Chicago, researchers controlled for various SIDS risk factors, including maternal smoking, soft sleep surface, pillow use, prone sleep position, and pacifier use. They found that sharing a bed with two other people was linked with a significant increase in SIDS risk. And the risk of SIDS increased dramatically if babies shared a bed with three or more people. By contrast, the researchers observed no increased SIDS risk for babies who shared their beds with just one person--their mothers (Hauck and Herman 2006).
Other risk factors
Bed sharing mortality has been linked with markers of lower socioeconomic status (SES), including overcrowded households, adolescent mothers, economic deprivation, and low levels of maternal education (e.g., Carpenter et al 2004; Fleming 2006; Ostfeld et al 2006).
Why? Lower SES is linked with higher rates of mortality in general, as well as higher rates of risky practices, like smoking. It also seems likely that SES is correlated with other conditions of the shared sleeping environment, like air quality and the condition of the mattress.
In any case, links between mortality and socioeconomic factors seem to underscore the point: The risks of shared sleep depend on the context.
Babies with multiple risk factors are especially vulnerable
In their recent meta-analysis of European case-control studies, Robert Carpenter and his colleagues (2013) note that risk factors don't just add up, they multiply. As as result, "infants with multiple risk factors are likely to be at a far greater risk than is generally supposed."
For example, the researchers estimate that a baby who shares a bed with two smoking parents has 65 times the risk of SIDS. But if this baby is also bottle-fed (with 1.5 times the risk), male (1.6 times), and of low birth weight (4.2 times), his overall risk is 655 times greater than it would be if he didn't bed share.
As of 2013, no one yet has demonstrated that keeping a baby in a crib or cot is any less hazardous than this mother-infant sleeping scenario:
• The sleeping surface is a firm mattress or mat pushed away from the wall and all other furniture
• There is no headboard, footboard, or railing attached to the bed
• The baby is placed on his back and his face is uncovered.
• There are no bed covers (neither blankets, duvets, nor top sheets), no soft toys and no dangerous bedding (e.g., pillows) near the baby.
• Care is taken to prevent the baby from overheating (i.e., the room is a comfortable temperature and the baby isn’t overdressed)
• There are no draperies, blinds, or cords nearby that the baby could get tangled in
• Neither mother nor infant is wearing anything could cover the baby’s face, get tangled around the baby’s neck, or constitute a choking hazard
• The baby can’t hurt himself by falling out of bed. For example, if the bed is elevated from the ground, the baby is protected from falling out by being placed between the mother and a safe barrier, like the Humanity Family Bed Cosleeping Pad.
• The mother is a nonsmoker and is unimpaired by alcohol, drugs, or exhaustion
• The mother doesn’t suffer from medical conditions that render her a “heavy” sleeper or a “restless” sleeper
• The mother is the only person sharing the sleeping surface with the baby
This might sound like a lot of stipulations. But these stipulations may be life-saving, and they reflect the traditional sleeping conditions found in places like Japan, where SIDS rates are low (Nelson et al 2001; Hauck and Tanabe 2008).
In fact, this scenario--which I’ll call the “primal co-sleeping scenario”--has probably been the most common infant sleeping arrangement in human history.
Does this mean that the “primal co-sleeping scenario” is risk-free?
No. As noted above, we lack studies regarding the safety of this style of co-sleeping. But until such studies are conducted, it's reasonable to assume that eliminating known hazards from the sleep environment will reduce risk to the baby.
For example, in one study of SIDS cases, the risk of sharing a bed became statistically insignificant after researchers controlled for the effects of recent maternal alcohol consumption, infant duvet use, overcrowding, and parental tiredness (Blair 2006).
And, as mentioned above, another study found no elevated SIDS risk for babies who shared a bed with their mothers only (Hauck and Herman 2006).
As researcher Peter Blair has noted, “It may not be bed-sharing per se, but the particular circumstances in which bed sharing occurs that is dangerous” (Blair 2006).
What’s the safest place for young babies?
Recommendations against bed sharing
In their 2005 policy statement, the American Academy of Pediatrics (AAP) Task Force on Sudden Infant Death Syndrome wrote
"...bed sharing, as practiced in the United States and other Western countries, is more hazardous than the infant sleeping on a separate sleep surface"
(AAP Task Force on Sudden Infant Death Syndrome 2005; emphasis mine).
As a result, the Task Force says, parents should avoid bed sharing. Instead, a baby can sleep in a crib or cot placed alongside the parent’s bed.
The Task Force based this recommendation on the European Concerted Actions on SIDS (“ECAS”) study, an analysis of sudden unexplained infant death cases reported in 20 different regions of Europe (Carpenter et al 2004). According to the ECAS data, bed sharing posed a significant risk for babies under 12 weeks of age, even for nonsmokers (Carpenter 2006). The SIDS risk was lowest for babies who slept in the same room as their parents--but in their own crib or cot.
More recently, Robert Carpenter and his colleagues performed another analysis of five European case-control studies (including the original ECAS) published in the 1990s.
Just as in the original ECAS study, the researchers didn’t control for the firmness of the mattress or the identity and number of people sharing a bed. Nor did researchers test the scrupulous “primal co-sleeping scenario” outlined above. Their analysis concerned shared sleep as it is typically practiced by Europeans – soft mattresses, loose bedding, and all.
But they did calculate the dangers for young babies who are usually considered low risk for SIDS – babies with parents who don’t, as a habit, smoke or drink – and they controlled for other factors like birth weight and breastfeeding.
Under these conditions, infant death was, on average, five times more likely among babies who bed-shared during the first 3 months postpartum (Carpenter et al 2013). And for lead author Carpenter, the implications are clear. As he told interviewer Salynn Boyles,
"For the first 3 months of life, babies should not sleep with their parents. Period. After that, if the parents don't smoke, it might be OK" (Boyles 2013).
Are such recommendations too sweeping? People concerned with broad, population-wide trends might say no.
The argument for general recommendations against bed sharing
True, these studies didn't control for the number and identity of people sharing the bed, nor did they address key risk factors associated with Western beds (Carpenter et al 2005; Carpenter 2006; personal communication 2008).
And on theoretical grounds, it isn't clear why bed sharing per se (as opposed to the particular circumstances of bed sharing) might put babies at higher risk of SIDS.
But the medical community didn’t wait to discover why babies who slept on their stomachs were more likely to die of SIDS. Once the link was established, parents were advised to place babies on their backs. And this approach paid off: As the “Back to Sleep” campaign spread, SIDS rates fell.
Moreover, even if there were no SIDS risk, there is still the risk of accidents. And the most certain way to prevent bed sharing accidents is to stop people from bed sharing.
So some people think it makes sense to avoid bed sharing altogether--at least for infants in the first few months after birth.
However, even putting aside objections about missing data, this argument doesn’t take into account the potential benefits of sharing a bed.
The benefits of bed sharing
Sleep, breastfeeding, bonding, and stress management
Sleeping together makes nocturnal breastfeeding less disruptive, and mothers who bed-share and breastfeed may get more sleep than do mothers who bottle-feed (Quillan and Glenn 2004).
This might explain why mothers who sleep with their babies
• spend more time breastfeeding at night (McKenna et al 1999; Gettler and McKenna 2011), and
• are more likely to continue breastfeeding over the long-term (Horsley et al 2007)
So shared sleep may benefit babies by increasing the duration of breastfeeding.
Emotional comfort and bonding
Bed sharing appears to have emotional benefits, too. Many parents feel that bed sharing strengthens their emotional bonds with their babies (McKenna and Volpe 2007).
Do the babies feel better? Experimental evidence suggests that they might. For example, sleeping together promotes skin-to-skin contact, and studies indicate that skin-to-skin contact—with or without breastfeeding--reduces physiological stress in infants (Gray et al 2000; Gray et al 2002).
Safety and protection from SIDS
Sleeping together permits parents to closely monitor their babies throughout the night. For instance, a parent may be more likely to notice if her baby has adopted a dangerous sleep position or has become ill. Indeed, one survey collected anecdotal accounts from parents who believed that bed sharing may have saved their babies lives (McKenna and Volpe 2007). Many of these parents reported that sharing a bed allowed them to identify and immediately intervene when their babies suffered respiratory crises.
Bed sharing might also have a protective effect against SIDS. That’s because babies who bed share experience more frequent arousals from sleep, and frequent arousals reduce the risk of SIDS (Mosko et al 1997; Mao et al 2004; McKenna and McDade 2005).
Bed sharing may protect babies indirectly, too. As noted above, bed sharing might encourage mothers to breastfeed, and babies who are breastfed have a reduced risk of being victimized by SIDS (Venneman et al 2009). Although it’s not yet clear why, one hypothesis is that breastfeeding protects babies via benefits to the immune system. According to this idea, breastfed babies are less likely to succumb to pathogens that can trigger life-threatening respiratory events.
A crucial tool for coping with high-need babies?
I think it’s important to recognize that some young babies have a very difficult time sleeping apart from their parents. For these so-called “fussy” or “high need” babies, the standard pediatric recommendations and folk remedies don’t seem to work (Sears and Sears 1996). The baby doesn’t fall asleep or stay asleep unless she is in close contact with a caregiver. Such babies may demand very frequent feedings, too. For the minority of parents who cope with high-need babies, sleeping together may seem like the only practical way for a family to get quality sleep.
Weighing the risks and benefits
For those parents who want to practice bed sharing, there may be quite a bit at stake.
Rather than abandon bed sharing, such parents may choose to modify their sleeping environment, eliminate known hazards, and practice the safest form of bed sharing possible.
As noted above, current studies address bed sharing “as practiced in the United States and other Western countries” (AAP Task Force on Sudden Infant Death Syndrome 2005). At present, it’s not known if the net risks of the “primal sleep scenario” are any greater than the net risks of using a cot or crib.
But it’s important to recognize how very far the typical Western, adult sleeping environment is from the primal sleep scenario outlined above. Accidental bed sharing deaths may be on the rise in the United States, particularly among socially and economically disadvantaged populations (Shapiro-Mendoza 2009). Some researchers speculate that this is because hazardous forms of bed sharing are becoming more common.
So we shouldn’t be complacent about these hazards. For parents living in the West, low-risk bed sharing may require some dramatic changes to their bedrooms and sleep routines.
Alternatively, parents may opt for other co-sleeping alternatives, like attaching an especially-designed baby “side car” to the side of the parental bed. One example is the Arm’s Reach cosleeper, a product endorsed by pediatrician William Sears and anthropologist James McKenna. As its name suggests, it permits parents to keep babies within arm’s reach—-something that just about every researcher agrees is a good idea.
The bottom line?
Researchers on both sides of the debate agree that
• Accidents happen. Although we lack information to quantify the risk, it’s clear that some babies have died in accidents on adult beds.
• Babies shouldn’t sleep on sofas, armchairs, or waterbeds
• SIDS rates are higher for babies who bed share if they were born preterm or were born small for their gestational age
• Babies shouldn’t share beds with adults who smoke or who are impaired by drugs, alcohol, or exhaustion
• Children and young babies shouldn’t sleep in the same bed
• Babies shouldn’t be left alone in adult beds
• Babies shouldn’t sleep in beds that include features known to be hazardous--like soft mattresses, loose bedding, and the entrapment hazards named above. Even a bed sheet may pose a risk.
Researchers also agree that
• It’s a good idea for young babies to sleep in the same room as their parent(s)
• The most recent meta-analysis of five case-control studies of European populations found a five-fold increased risk for young babies (< 3 months old) who bed share--even when the mothers were nonsmokers and avoided alcohol.
• Such studies haven’t controlled for all possible confounding variables, especially the many hazards posed by Western beds
Why is there a link between bed sharing and SIDs in these studies?
Future research--randomized, controlled, prospective studies--will help us answer this question.
Meanwhile, there is controversy about how medical professionals should advise parents. Should official recommendations discourage parents from all forms of bed sharing? Or should parents be provided with information about the specific circumstances known to make bed sharing risky?
Given the mission of this website, you can probably guess my own position. According to Peter Blair, the current practice in England is to avoid a “one size fits all” piece of advice. Instead, “parents are given the information as it is” (Blair 2006).
Sounds like a good idea to me.
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