Working memory and sleep in 6- to 13-year-old schoolchildren

J Am Acad Child Adolesc Psychiatry. 2003 Jan;42(1):85-92. doi: 10.1097/00004583-200301000-00014.


Objective: To study the associations between sleep quality/quantity and performance in auditory/visual working memory tasks of different load levels.

Method: Sixty schoolchildren aged 6 to 13 years from normal school classes voluntarily participated. Actigraphy measurement was done during a typical school week for 72 consecutive hours. It was timed together with the working memory experiments to obtain information on children's sleep during that period. The n-back task paradigm was used to examine auditory and visual working memory functions.

Results: Lower sleep efficiency and longer sleep latency were associated with a higher percentage of incorrect responses in working memory tasks at all memory load levels (partial correlations, controlling for age, all p values < .05, except in visual 0-back and auditive 2-back tasks); shorter sleep duration was associated with performing tasks at the highest load level only (partial correlations, controlling for age,p < .05). Also in general linear models (controlling for age, gender, and socioeconomic status), sleep efficiency (F = 11.706, p = .050) and latency (F = 3.588, p = .034) were significantly associated with the mean incorrect response rate in auditory working memory tasks.

Conclusions: Sleep quality and quantity affect performance of working memory tasks in school-age children. In children with learning difficulties the possibility of underlying sleep problems should be excluded.

Publication types

  • Clinical Trial
  • Controlled Clinical Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Child
  • Female
  • Finland
  • Humans
  • Linear Models
  • Male
  • Memory, Short-Term*
  • Reaction Time
  • Sleep*
  • Statistics, Nonparametric