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Updated: Oct 29, 2025

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
Published on: October 2, 2019
Bedtime routines and objectively assessed sleep in infants
Shao-Yu Tsai1,2, Chien-Chang Lee3, Han-Yi Tsai1,4
1School of Nursing, College of Medicine, National Taiwan University, Taipei, Taiwan.
Insights
Establishing a consistent bedtime routine by 9 PM is crucial for longer and more stable infant sleep. A routine of at least 5 nights weekly promotes better sleep duration and consistency in infants.
Area of Science:
- Pediatrics
- Sleep Medicine
- Developmental Psychology
Background:
- Parental bedtime routines significantly influence infant sleep patterns.
- Understanding the impact of timing and consistency is vital for infant well-being.
Purpose of the Study:
- To investigate the association between the timing and consistency of parent-initiated bedtime routines and infant night-time sleep duration and variability.
- To provide evidence-based recommendations for optimizing infant sleep through bedtime routines.
Main Methods:
- Prospective observational study involving 320 healthy 6-month-old infants.
- Actigraphy was used to measure infant sleep for one week.
- General linear models analyzed the relationship between bedtime routine variables and sleep outcomes.
Main Results:
- Starting bedtime routines after 9 PM was linked to shorter infant sleep duration.
- Inconsistent bedtime routines (fewer than 5 nights/week) were associated with more variable night-time sleep.
- Routines initiated before 9 PM and conducted 5-7 nights/week showed optimal results.
Conclusions:
- A consistent bedtime routine, initiated no later than 9 PM and performed at least 5 nights weekly, is associated with longer and less variable infant sleep.
- Findings support incorporating consistent bedtime routines into anticipatory guidance for parents.
- Future research should consider sleep variability as a key outcome in evaluating bedtime routine interventions.
Aims:
To examine the association of the timing and consistency of parent bedtime routines with infant night-time sleep duration and variability.
Design:
This was a prospective observational study conducted between November 2012 and November 2016.
Methods:
Three hundred and twenty healthy 6-month-old infants were recruited from the well-child clinics of a university-affiliated hospital in northern Taiwan. Participating families provided sociodemographic, health and bedtime routine information. Infants wore an actigraph on the ankle for a week. General linear model analysis was performed with the frequency and timing of bedtime routines treated as the primary predictor variables of interest.
Results:
One hundred and ninety-seven (61.6%) parents started the bedtime routine for infants after 9 PM, with 162 (50.6%) not having the exact same bedtime routine every night. In both crude and adjusted analyses, starting a bedtime routine after 9 PM was associated with shorter infant night-time sleep duration (b = -23.55, p < 0.01). Infants with a bedtime routine of <3-4 nights per week were associated with more variable night-time sleep duration than a bedtime routine of 5-6 nights per week (b = -7.81, p < 0.05) or every night (b = -8.47, p < 0.05).
Conclusion:
A bedtime routine of at least 5 nights a week and initiated no later than 9 PM was associated with longer and less variable night-time sleep in infancy. Findings suggest that a consistent bedtime routine implemented in accordance with age-appropriate bedtimes should be addressed as part of anticipatory guidance in the well-child clinics. Future studies should include infant sleep variability as an outcome in addition to the conventional mean-level sleep variable analyses to more thoroughly characterize bedtime routine effects.
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