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Related Experiment Video

Updated: Apr 18, 2026

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
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Timely sleep facilitates declarative memory consolidation in infants.

Sabine Seehagen1, Carolin Konrad2, Jane S Herbert3

  • 1Department of Psychology, Ruhr-Universität Bochum, 44787 Bochum, Germany; and sabine.seehagen@rub.de.

Proceedings of the National Academy of Sciences of the United States of America
|January 14, 2015
PubMed
Summary

Infant sleep significantly aids memory. Napping after learning improved declarative memory recall in 6- and 12-month-old infants after both 4-hour and 24-hour delays, showing sleep

Keywords:
daytime napsdeferred imitationinfant developmentsleep-dependent memory

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Area of Science:

  • Developmental Psychology
  • Neuroscience
  • Sleep Science

Background:

  • Human infants spend a significant amount of time sleeping.
  • The role of sleep in early memory processing, particularly declarative memory, remains largely unexplored in infancy.
  • Understanding memory consolidation in the first year of life is crucial for cognitive development.

Purpose of the Study:

  • To investigate the effect of sleep on declarative memory consolidation in 6- and 12-month-old infants.
  • To determine if napping after a learning event enhances memory recall after short (4-hour) and long (24-hour) delays.
  • To provide experimental evidence for sleep's role in early memory processing.

Main Methods:

  • Two experiments tested declarative memory for novel actions in 6- and 12-month-old infants after 4-hour and 24-hour delays.
  • Infants were assigned to either a nap condition (napping within 4 hours of learning) or a no-nap condition.
  • Memory performance was compared between nap and no-nap groups, and with age-matched control groups.

Main Results:

  • Infants who napped after learning demonstrated significantly better recall of target actions compared to those who did not nap, across both delay periods.
  • Memory performance was notably higher in the nap condition group after the 24-hour delay.
  • The study provides the first experimental evidence for sleep enhancing declarative memory consolidation in infants.

Conclusions:

  • Sleep plays a critical role in consolidating declarative memories during the first year of life.
  • Napping shortly after learning significantly improves memory retention in human infants.
  • These findings highlight the importance of sleep for early cognitive development and memory formation.