Original articleDaytime Sleepiness and Associated Factors in Japanese School Children
Section snippets
Study Site
The study was conducted in 93 public junior high schools, located in Toyama prefecture, on the Japan Sea side of the central part of Honshu main island, northwestern Japan. Toyama prefecture is a typical postindustrial province, with no significant economic, social, or cultural differences between the cities (n = 9), towns (n = 18) and villages (n = 8) that participated in the present study. The area is highly developed and the economy is predominately industrial and high technology. The
Results
The Figure shows the characteristics of the subjects by sex. Sleepiness episodes were reported as almost always or often by 25.2% and 47.6%, respectively. No episode of sleepiness was reported only by only 10.4%. After combining the categories of “almost always” and “often” into one group to derive the measure of sleepiness, in parallel with the categories “seldom” and “never” to derive the measure of “no sleepiness,” we examined the difference by sex; 34% of boys versus only 20.8% of girls
Discussion
Junior high school appears to be a high risk period for the development of sleepiness and other sleep disturbances as a result of chronic sleep deficiency.16, 17 In our sample of children, 25.1% and 47.5%, respectively, reported their sleepiness episodes as almost always or often. In adolescent studies, the prevalence of sleepiness starts at 10%, with upper reported values between 20% and 60%.12, 18, 19, 20, 21 Saarenpaa-Heikkila et al21 mentioned that sleepiness was more common in adolescents
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