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May 8, 2026Sleep MedicineOpen Access

Infant Sleep Quality Predicts Changes in Temperament Across the First Year of Life

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Authors

YZYael Porat ZaigerTNTehila NadavAHAvel Horwitz

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Overview

Randomized trial examines how infant sleep impacts temperament changes, implying sleep quality influences behavior.

Key Points

  • This study aims to explore the bidirectional associations between infant sleep quality and temperament across the first year of life.
  • Recruitment of 232 couples during pregnancy
  • Assessment of infant sleep quality via actigraphy and sleep diaries at 4, 8, and 12 months
  • Use of Random Intercept Cross-Lagged Panel Models to analyze data.
  • Poorer sleep quality and higher WASO predicted increased unpredictability in temperament at later assessments
  • No significant effects of temperament on sleep quality were found
  • Associations were primarily within-person rather than between-person.

Cite This Study

Zaiger et al. (2026) studied this question.

synapsesocial.com/papers/69fd7ddcbfa21ec5bbf060c7https://doi.org/10.1016/j.sleep.2026.109000
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