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Related Experiment Video

Updated: Jun 6, 2025

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
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An afternoon nap facilitates analogical transfer in creative problem solving.

Carmen E Westerberg1, Sean E Fickle1, Chloe E Troupe1

  • 1Department of Psychology, Texas State University, San Marcos, Texas, USA.

Journal of Sleep Research
|November 27, 2024
PubMed
Summary

Napping after learning helps solve difficult problems by improving analogical transfer. REM sleep strengthens memory connections, making it easier to see similarities between problems and find solutions.

Keywords:
REManalogical transfermemory consolidationproblem solvingsleep

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Sleep Research

Background:

  • Analogical problem solving relies on transferring solutions from known (source) to new (target) problems.
  • Successful analogical transfer is often hindered by the difficulty in recognizing structural similarities between problems.
  • REM sleep is theorized to aid memory consolidation, potentially enhancing the identification of weakly related memories and improving analogical reasoning.

Purpose of the Study:

  • To investigate the effect of a nap, specifically REM sleep, on analogical problem-solving abilities.
  • To determine if sleep enhances the ability to solve problems that were initially unsolvable.
  • To explore the role of perceived similarity in sleep-mediated analogical transfer.

Main Methods:

  • Participants solved source problems, received solutions, and then attempted to solve structurally similar target problems.
  • A 2-hour break followed, involving either a nap (n=28) or quiet wakefulness (n=30).
  • Post-break performance on target problems, source problem memory, and perceived similarity were assessed.

Main Results:

  • The nap group solved a significantly higher proportion of previously unsolvable target problems compared to the wake group.
  • No significant differences were found between groups in initial problem-solving rates or source problem memory recall.
  • The nap group reported higher perceived similarity between source and target problems post-break, with REM sleep duration correlating positively with successful transfer.

Conclusions:

  • Sleep, particularly REM sleep, significantly enhances the ability to solve problems requiring analogical transfer.
  • Sleep appears to improve analogical reasoning by facilitating the recognition of subtle structural commonalities between problems.
  • These findings suggest that napping can be a valuable strategy for overcoming cognitive hurdles in problem-solving.