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Longer nocturnal sleep duration in infants is associated with higher personal-social and communication development scores at 12 months

In a cohort of 646 Iranian infants, longer nocturnal sleep duration was significantly associated with higher personal-social development scores (β=0.52, p=0.03) and better communication scores (β=0.42, p=0.05). Increased night waking duration was negatively associated with personal-social and total ASQ scores, while more frequent night wakings were linked to lower problem-solving scores.

Last updated: Jul 8, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score34/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. The associations between infant sleep habits and neurodevelopmental outcomes at 12 months: a sub-study of the PERSIAN birth cohort.

observational

Bemanalizadeh M, Yazdi M, Yaghini O, Goli P, Daniali SS, Kelishadi R · Pediatric research (2026)

Participants: N/A
Duration: 12 months (cross-sectional at 12 months)
Intervention: Infant sleep habits (nocturnal sleep duration, night waking frequency and duration, sleep onset time, sleep latency)
Outcome: Neurodevelopmental outcomes at 12 months measured by Ages and Stages Questionnaire (ASQ) domains: communication, gross motor, fine motor, problem-solving, personal-social
Effect Size: β=0.52 for personal-social; β=0.42 for communication; β=-0.92 for night waking duration and personal-social; β=-2.01 for night waking duration and total ASQ; β=-0.44 for night waking frequency and problem-solving; β=-0.59 for later sleep onset and personal-social
Population: 646 infants from the PERSIAN Birth Cohort in Isfahan, Iran

Result:

PubMed: 42365166DOI: 10.1038/s41390-026-05236-5

Mechanism Graph

Infant sleep supports neural plasticity and brain maturation
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Longer nocturnal sleep consolidates memory and social-emotional processing
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Disrupted sleep (frequent/long night wakings) impairs cognitive and social development
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Result: Better sleep continuity and duration enhance neurodevelopmental outcomes

Limitations

  • ⚠Observational study, cannot establish causality
  • ⚠Single time point assessment at 12 months, no longitudinal follow-up
  • ⚠Reliance on parent-reported sleep and developmental questionnaires, potential recall bias

Frequently Asked Questions

What specific neurodevelopmental domains were associated with infant sleep?▼

Longer nocturnal sleep was associated with higher personal-social and communication scores. Night waking duration was negatively associated with personal-social and total ASQ scores, while night waking frequency was linked to lower problem-solving scores.

How was infant sleep measured in this study?▼

Sleep characteristics were assessed using the Brief Infant Sleep Questionnaire (BISQ), which included nocturnal and daytime sleep duration, night waking frequency and duration, sleep onset time, and sleep latency.

What population was studied?▼

The study included 646 infants from the PERSIAN Birth Cohort in Isfahan, Iran, representing a non-Western, Middle Eastern population.

What were the key limitations of this study?▼

The study was observational, so causality cannot be inferred. It relied on parent-reported data, which may introduce recall bias, and assessed outcomes only at 12 months without longitudinal follow-up.

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References

  1. 1.Bemanalizadeh M, Yazdi M, Yaghini O, Goli P, Daniali SS, Kelishadi R. "The associations between infant sleep habits and neurodevelopmental outcomes at 12 months: a sub-study of the PERSIAN birth cohort.." Pediatric research, 2026. PMID: 42365166 DOI: 10.1038/s41390-026-05236-5
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.