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Updated: Dec 14, 2025

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
Published on: October 2, 2019
Postural change for supine position does not disturb toddlers' nap
Hidenobu Ohta1,2,3, Yoshihisa Oishi4, Takako Hirose4
1Department of Pyschophysiology, National Institute of Mental Health, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-higashi-cho, Kodaira, Tokyo, 187-8553, Japan. hideohta@med.akita-u.ac.jp.
Insights
Changing toddlers' sleep position from prone to supine, a sudden unexplained death in childhood (SUDC) prevention method, does not disrupt their naps. Infants briefly woke or remained asleep after staff adjusted their sleeping position during nursery naps.
Area of Science:
- Pediatrics
- Sleep Medicine
- Public Health
Background:
- Sudden unexplained death in childhood (SUDC) is a concern, prompting preventative measures like the "Back to Sleep" campaign (BSC).
- Japanese nurseries routinely adjust toddlers' sleeping positions from prone to supine during naps as a SUDC preventative strategy.
- The BSC recommendations, applied to infants over one year old since 1996, aimed to decrease SUDC rates.
Purpose of the Study:
- To investigate if forced postural changes from prone to supine during toddler naps disturb sleep.
- To assess the impact of a common SUDC preventative measure on young children's sleep quality in a nursery setting.
Main Methods:
- Fifty-two toddlers (18.4 ± 3.3 months) were monitored for 8 hours using actigraphy and accelerometers to track sleep status and body position (prone, supine, lateral).
- Nursery staff manually repositioned 24 toddlers from prone to supine during naps.
- Wake-sleep status and duration of awakenings after positional changes were recorded.
Main Results:
- Manual repositioning from prone to supine resulted in minimal or no waking for toddlers.
- When awakenings occurred, they were brief (3.1 ± 4.9 minutes), with toddlers quickly returning to sleep.
- The majority of toddlers did not experience significant sleep disturbance due to the positional adjustments.
Conclusions:
- Manual adjustment of toddlers' sleeping position from prone to supine does not negatively impact their sleep during naps.
- This practice, implemented as a potential SUDC prevention method, appears safe and minimally disruptive to toddler sleep.
- Findings support the continued use of positional adjustments in nurseries as a SUDC preventative measure without compromising sleep quality.
Abstract:
This study examined whether forced postural change from prone to supine during toddlers' nap, a preventative measure taken in Japan for sudden unexplained death in childhood (SUDC), disturbs toddlers' sleep. When the "Back to Sleep" campaign (BSC) was introduced to Japan in 1996, its recommendations were also applied to infants aged 1 year old and over with the expectation that the BSC recommendations may also contribute to a decrease in the occurrence rate of SUDC. Since then, Japanese nurseries have routinely conducted sleeping position checks and positional adjustments of toddlers every 5-10 min during naps. A total of 52 toddlers (age 18.4 ± 3.3 months, means ± SD) were continuously monitored for 8 h during daytime at nursery schools for wake-sleep status and body position (prone, supine and lateral) with actigraphs and 3-orthogonal-axis accelerometers. Out of the 52 toddlers, 24 toddlers adopted prone positions during naps, which were adjusted by nursery staff back to supine. When nursery staff manually changed the toddlers position from prone to supine, the toddlers either did not wake or woke only briefly (3.1 ± 4.9 min) and returned to sleep soon after the positional change. Our study indicates that manual change of toddlers' sleeping position from prone to supine, a potential SUDC prevention method, does not disturb toddlers' sleep during their naps.
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