Poor sleep and lower working memory in grade 1 children: cross-sectional, population-based study

Area of Science:

• Child Psychology
• Cognitive Neuroscience
• Sleep Science

Background:

• Poor sleep and working memory deficits are independently linked to learning difficulties.
• The relationship between sleep quality and working memory in childhood remains under-explored.

Purpose of the Study:

• To investigate the association between poor sleep and working memory capacity in a population-based sample of first-grade children.
• To determine if sleep characteristics predict verbal and visuospatial working memory performance.

Main Methods:

• Cross-sectional study of 1749 first-grade children in Melbourne, Australia.
• Parental questionnaires assessed sleep (perceptions, bedtime regularity, duration, onset latency).
• Computerized assessments measured verbal (digit recall) and visuospatial (Mister X) working memory.

Main Results:

• Poor sleep, less bedtime regularity, and shorter sleep duration were significantly associated with poorer verbal working memory.
• No association was found between poor sleep and visuospatial working memory.
• Effect sizes for verbal working memory associations ranged from 0.3 to 1.2.

Conclusions:

• Poor sleep is a significant population-level correlate of reduced verbal working memory in early school-aged children.
• These findings underscore the importance of adequate sleep for developing verbal working memory, a crucial component for academic achievement.