Time for bed: associations with cognitive performance in 7-year-old children: a longitudinal population-based study

Area of Science:

• Developmental Psychology
• Child Cognitive Development
• Pediatric Health

Background:

• Limited understanding of the relationship between early childhood bedtime consistency and cognitive development.
• Early childhood is a critical period for cognitive growth and long-term health outcomes.

Purpose of the Study:

• To investigate the association between bedtime regularity in early childhood and cognitive test scores at age seven.
• To determine if gender influences the relationship between bedtime consistency and cognitive performance.

Main Methods:

• Utilized data from the UK Millennium Cohort Study, including 11,178 children.
• Analyzed bedtime consistency at ages 3, 5, and 7, alongside cognitive test scores (z-scores) for reading, maths, and spatial abilities at age 7.

Main Results:

• Irregular bedtimes at age 7 were linked to lower cognitive scores in girls, but not boys.
• Non-regular bedtimes at age 3 were independently associated with lower cognitive scores in both genders.
• Cumulative effects observed: girls with consistently irregular bedtimes showed significantly lower scores, while boys showed deficits with irregular bedtimes at two or more ages.

Conclusions:

• Consistent bedtime routines in early childhood are positively associated with cognitive performance at age seven.
• The findings suggest potential long-term implications for health and development due to the importance of early childhood experiences.