Co-Sleeping Around the World: How Different Cultures Approach Family Sleep

In 2025, the American Academy of Sleep Medicine published data showing that half of American parents co-sleep with their children—despite decades of official recommendations against it. This statistic surprised many, but it shouldn't have. Globally, co-sleeping is not the exception; it is the overwhelming norm.

Anthropological research estimates that in approximately 90% of the world's cultures, past and present, infants sleep in close proximity to their caregivers. The separate nursery—a child sleeping alone in a dedicated room from birth—is a relatively recent Western invention, emerging primarily in the 20th century among middle-class families in the United States, United Kingdom, and parts of Northern Europe.

This article takes a global tour of family sleep practices, examining what different cultures can teach us about sleeping together safely and well.

Japan is perhaps the most studied co-sleeping culture, and for good reason. Over 70% of Japanese families co-sleep, typically on firm futons laid on tatami mat floors. The practice is so culturally embedded that the Japanese word for the family sleeping arrangement—kawa no ji (川の字)—literally means "the character for river," describing the visual of a child sleeping between two parents like water flowing between riverbanks.

Despite this near-universal co-sleeping, Japan has one of the lowest SIDS rates in the world: approximately 0.1 per 1,000 live births, compared to 0.33 in the United States. The Japanese approach emphasizes firm sleep surfaces, minimal bedding, and a cultural norm of sobriety around infants.

The Japanese example demonstrates that co-sleeping itself is not inherently dangerous—the conditions under which it occurs are what matter.

In Denmark, Sweden, Norway, and Finland, co-sleeping has deep cultural roots. The concept of the familjensäng (family bed) in Sweden and familieseng in Denmark is not a fringe practice but a mainstream choice.

Scandinavian countries combine co-sleeping with some of the world's most comprehensive parental leave policies (up to 480 days in Sweden), strong breastfeeding support, and a cultural emphasis on family well-being over rigid schedules. The result: SIDS rates of 0.14–0.2 per 1,000—among the lowest in the world.

The Scandinavian approach has also driven innovation in sleep products. The continental bed system—a spring base with a separate top mattress—originated in Scandinavia and provides the firm, gap-free surface that safety guidelines recommend. Companies like FAMBED have taken this tradition further, creating modular family bed systems specifically designed for co-sleeping families.

In India and across South Asia, co-sleeping is virtually universal and often extends beyond the nuclear family. Grandparents, aunts, and older siblings may all share sleeping spaces with infants and young children. The practice is deeply connected to cultural values of family closeness, collective care, and the belief that children should never sleep alone.

Research by Shimizu et al. (2014) found that Indian mothers who co-slept reported stronger feelings of bonding with their infants and lower rates of postpartum depression compared to mothers in Western countries where solitary sleep was the norm.

Across Latin America, co-sleeping rates exceed 70% in most countries. The practice is connected to the cultural concept of familismo—the centrality of family in all aspects of life. Separate nurseries are uncommon, and the idea of an infant sleeping alone is often viewed with concern rather than approval.

In Guatemala, a study by Morelli et al. (1992) found that Mayan mothers were shocked when told that American babies slept in separate rooms. They viewed the practice as neglectful and potentially harmful to the child's emotional development.

Across sub-Saharan Africa, co-sleeping is nearly universal and is closely linked to breastfeeding practices. The WHO's recommendation of breastfeeding for two years or beyond is most consistently achieved in African cultures where nighttime nursing—facilitated by co-sleeping—is the norm.

Anthropologists consider African co-sleeping practices to be closest to the ancestral human pattern. For the vast majority of human evolutionary history, infants slept in contact with their mothers. The separate nursery is, in evolutionary terms, a very recent experiment.

The global perspective offers several clear lessons:

1. Co-sleeping is the human norm, not an aberration. Solitary infant sleep is the historical and cultural outlier.
2. Safety depends on conditions, not on proximity itself. Cultures with high co-sleeping rates and low SIDS rates share common features: firm surfaces, minimal bedding, low smoking rates, and strong breastfeeding cultures.
3. The sleep surface matters. Japanese futons, Scandinavian continental beds, and other traditional co-sleeping surfaces are all firm and flat—consistent with what modern research identifies as safe.
4. Cultural support matters. In cultures where co-sleeping is normalized, families receive guidance on how to do it safely rather than being told not to do it at all.

For Western families choosing to co-sleep, the lesson is clear: you are not doing something unusual or dangerous. You are joining the global majority. The key is to do it with the same intentionality that characterizes the world's safest co-sleeping cultures: firm surfaces, adequate space, and informed practices.