Atomic Parenting · Sleep Science

Where Your Child Sleeps Is a Cultural Question; Not a Developmental One

Two studies of 31,877 families across 17 countries, and one question parents bring me every week.

Kevin Luczynski · May 6, 2026

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"A four-year-old sleeps in their parents' bed. Is that a sleep concern?"
It is essential that we talk with each family because there are notable cultural differences in where children sleep, when they go to bed, when they wake up, and if they nap.
A scrollytelling companion to the Atomic Parenting post.
Two Studies

One Developmental Window, Birth to Age 6

201029,287 infants and toddlers across 17 countries (ages 0 to 36 months). Mindell, Sadeh, Wiegand, How, & Goh.
20132,590 preschoolers across 13 of those same countries (ages 3 to 6 years). Mindell, Sadeh, Kwon, & Goh.
Why This Matters in Practice
Culturally-based values and beliefs regarding the meaning, importance, and role of sleep in daily life... have a profound effect not only on how a parent defines a sleep "problem" but on the relative acceptability of various treatment strategies.
Mindell, Kuhn, Lewin, Meltzer, & Sadeh, 2006, p. 1264
Hours per 24, by age. Predominantly Caucasian and predominantly Asian groups, with the all-country preschool trajectory.
Predominantly Caucasian (2010)
Predominantly Asian (2010)
All 13 countries (2013)
Group means with whiskers showing ±1 SD. Country rankings are stable from infancy through preschool.
Predominantly Caucasian
Predominantly Asian
Ages 0–32010
17 countries · n = 29,287
Ages 3–62013
13 countries · n = 2,590
Showing ages 0–3 (2010). View on desktop for the 2013 paired panel.
The largest cross-cultural effect in either Mindell paper (effect size φ = .70 in the 2013 paper).
Predominantly Caucasian
Predominantly Asian
Ages 0–32010
17 countries · % in own room
Ages 3–62013
13 countries · % in own room
Showing ages 0–3 (2010). View on desktop for the 2013 paired panel.
2010 used "more than 4 nights/week"; 2013 used "3 or more nights/week." Rankings comparable; absolute percentages are not.
Predominantly Caucasian
Predominantly Asian
Ages 0–32010
routine >4 of 7 nights
Ages 3–62013
routine ≥3 of 7 nights
Showing ages 0–3 (2010). View on desktop for the 2013 paired panel.
Source: Mindell et al. (2010, 2013), Sleep Medicine. Figures plotted by Luczynski, 2026, from published Tables 2 and 5 (Charts 2-4) and Figure 2 plus Results trajectory means (Chart 1).
The clinical question

A four-year-old sleeps in their parents' bed. Whether that is a sleep concern is a question to work out with the family. Cultural practices around where children sleep, when they go to bed, when they wake up, and if they nap differ considerably across countries.

The same arrangement, two cultures
76%vs 7% Preschoolers sleeping in their own room: United States vs China (Mindell et al., 2013)

What is the everyday baseline in one country is the unusual exception in another.

Two studies, one window

Mindell and colleagues built two cross-cultural surveys with overlapping country lists and a parallel questionnaire. Together they cover the first six years of life.

Culture shapes the question

Before reading the data, hear from the authors of the 2006 American Academy of Sleep Medicine review on behavioral treatment of bedtime problems.

Total sleep, birth to age 5

Hours per 24 on the y-axis. Age in months on the x-axis. The dashed line at age 3 marks the study transition from Mindell 2010 to Mindell 2013. By the second half of the first year, predominantly Caucasian (P-C) infants are sleeping more per 24 hours than predominantly Asian (P-A) infants. The gap holds through toddlerhood.

About 43 minutes
0.71 hraggregate gap P-C minus P-A across infants and toddlers (Mindell et al., 2010, Table 4)

The two groups are sleeping different amounts in similar developmental periods.

By age 3, both groups converge

The preschool trajectory declines about 42 minutes from 11.32 hours at age 3 to 10.64 hours at age 5 (Mindell et al., 2013, p. 1286). The 2013 paper found no significant interaction between age and culture across this stretch.

Bedtimes spread by almost 3 hours
2h 51mspread From New Zealand's 7:28 PM to Hong Kong's 10:17 PM at infant and toddler ages

New Zealand, the United Kingdom, and Australia anchor the early end at every age (group means before 8:00 PM). India and Hong Kong anchor the late end (after 10:00 PM).

Rankings stay stable

Country rankings are remarkably similar from infancy through preschool. The cultural patterns shaping when a child goes to bed are present from the start and do not wash out as the child gets older.

The largest cross-cultural effect
φ = .70effect size Own room, 2013 paper (Table 4) — the largest cultural effect across all variables

In P-C countries, most children sleep in their own room from infancy onward. In P-A countries, the rates remain very low at both ages.

Cultural baseline, not a developmental stage

In several P-A countries, the percentage of children sleeping in their own room remains in single digits through age 6. Room-sharing is not a stage children grow out of; it is the everyday arrangement.

Listening comes first

Where a child sleeps and when a child goes to bed differ across the world. What looks like a problem in one country is a cultural expectation in another.

Every discussion about a potential sleep concern requires listening to what is valued by the family at the start and throughout the assessment and treatment process.

What this does and does not say

The cross-cultural patterns are present from infancy and stable into the preschool years. The cultural shape of children's sleep is not something children grow into.

The patterns are not uniformly negative for either group. Predominantly Asian children sleep less at night but room-share at much higher rates, both of which align with cultural norms rather than sleep problems per se.

The bedtime routine is the variable with the most movement across age within cultures, and it is also the variable a parent has the most direct control over. Practitioners who use blanket sleep recommendations developed in one cultural context with families from another should expect friction that has nothing to do with the family doing anything wrong.

Read the full post: https://www.atomicparenting.com/p/cultural-differences-in-pediatric

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Mindell, J. A., Kuhn, B., Lewin, D. S., Meltzer, L. J., & Sadeh, A. (2006). Behavioral treatment of bedtime problems and night wakings in infants and young children. Sleep, 29(10), 1263–1276. https://doi.org/10.1093/sleep/29.10.1263

Mindell, J. A., Sadeh, A., Wiegand, B., How, T. H., & Goh, D. Y. T. (2010). Cross-cultural differences in infant and toddler sleep. Sleep Medicine, 11(3), 274–280. https://doi.org/10.1016/j.sleep.2009.04.012

Mindell, J. A., Sadeh, A., Kwon, R., & Goh, D. Y. T. (2013). Cross-cultural differences in the sleep of preschool children. Sleep Medicine, 14(12), 1283–1289. https://doi.org/10.1016/j.sleep.2013.09.002

Figures by Luczynski, 2026, from data published in the two Mindell papers. The exact figures shown in this scrollytelling do not appear in either source paper.