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A Proposal on the Novel Method to Estimate Optimal Sleep Duration Based on Self-Reported Survey Data

Journal of Behavioral and Brain Science 2024年第8期14卷 227-239页

作者： jun kohyama Department of Pediatrics Tokyo Bay Urayasu Ichikawa Medical Center Chiba Japan

Background: Many adolescents have a sleep debt. Individuals sleeping for their optimal sleep duration are expected to experience no sleepiness. Then, it is important to recognize one’s optimal sleep duration to reduce sleep debt. However, there is no simple method to determine this value. Since body mass index and sleep duration exhibit a U-shaped association, it is expected that a person taking optimal sleep duration would show no marked deviation from the mean body mass index value for the population evaluated. By using self-reported sleepiness and standardized body mass index, this study aimed to estimate individual optimal sleep duration. Methods: Data from 2540 grade 5 - 11 students were used. Students who declared no sleepiness during class and also had a gender- and grade-standardized body mass index of ±1.5 were termed ideal students. The average sleep durations of ideal students were compared with those of non-ideal students. The differences of sleep duration between ideal and no-ideal students were added to habitual sleep duration of each non-ideal student to obtain assumed optimal sleep duration. A multiple regression line to predict assumed optimal sleep duration was calculated using the least squares method. Results: The mean sleep duration of 666 ideal students exceeded the lower limit of daily sleep duration proposed as “may be appropriate” for children aged 6 - 17 years by National Sleep Foundation of the USA, being longer than those of non-ideal students. Significant regression formula for assumed optimal sleep duration was obtained (adjusted R2 = 0.996, p Conclusions: No contradiction was identified in the sleep duration obtained from ideal students as with optimal sleep duration. Although further studies to confirm the current estimation are needed, a simple formula to estimate individual optimal sleep duration through easily obtainable parameters was proposed.

关键词： Body Mass Index Catch-Up Sleep Insufficient Sleep Syndrome Optimal Sleep Duration Sleepiness

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Non-School Day Catch-Up Sleep among Pupils in Japan

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Journal of Behavioral and Brain Science 2023年第6期13卷 113-125页

作者： jun kohyama Tokyo Bay Urayasu/Ichikawa Medical Center Urayasu Japan

Backgrounds: Weekend catch-up sleep is the difference in sleep duration between the weekend and weekdays, and reflects sleep debt, whose significance is hypothesized to be altered by weekday sleep duration. This study aimed to assess this hypothesis. Methods: Multiple-comparison tests and multiple-regression analyses were conducted on questionnaires asking various lifestyle habits obtained from 2722 pupils in grades 5 to 12 and stratified by groups of pupils with shorter (≤7 hours) or longer (>7 hours) sleep duration on the nights before schooldays. Results: The percentage of pupils in negative non-school day catch-up sleep category was 6.6%, whereas that in non-school day catch-up sleep > 2 hours was 14.4%. In comparison with the reference category (non-school day catch-up sleep of zero), multiple comparison tests on lifestyle habits revealed significantly longer screen time in the shorter sleep-duration group of pupils with negative non-school day catch-up sleep and those with non-school day catch-up sleep > 2 hours. This analysis also demonstrated a significantly longer screen time in the longer sleep-duration group of pupils with non-school day catch-up sleep > 2 hours. Physical activity in pupils with negative non-school day catch-up sleep in the longer sleep-duration group was significantly longer, while that in pupils with non-school day catch-up sleep > 2 hours in the shorter sleep-duration group was significantly shorter. In the longer sleep-duration group, pupils with non-school day catch-up sleep > 2 hours showed poorer academic performance. Multiple regression analysis revealed that longer physical and after-school activities were significantly associated with non-school day catch-up sleep decrease in both the study groups. In the longer sleep-duration group, male gender, shorter screen time, and higher standardized body mass index were significantly associated with decreased non-school day catch-up sleep. Conclusions: Sleep duration before school days c

关键词： Academic Performance Body Mass Index Physical Activity After-School Activity Screen Time

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Determinants of Sleepiness among Pupils in Kanto District of Japan

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Journal of Behavioral and Brain Science 2021年第5期11卷 97-106页

作者： jun kohyama Department of Paediatrics Tokyo Bay Urayasu Ichikawa Medical Centre Urayasu Japan

Backgrounds: Sleepiness is reported to predict sleep quality, academic performance and self-regulation. This study aimed to discover determinants of sleepiness. Methods: On 2722 questionnaires obtained from pupils in grades 5 - 12 in the Kanto district of Japan, lifestyle habits associated with sleepiness were analyzed using a multivariable logistic regression model. Results: The rate of sleepy pupils (who feel sleepy during class as often and always) increased from elementary school (6.3%) to senior high school (42.4%) via junior high school (17.1%). Higher grade (adjusted odds ratio [OR], 1.28;95% confidence interval [CI], 1.21 - 1.37;p Conclusions: To reduce adolescents’ sleepiness in the Kanto district of Japan, we recommend them to have adequate waking time, and to avoid late bedtime, breakfast skipping, excessive screen time, after-school activity, and physical activity. Further prospective studies are needed to confirm involvements of these recommended factors in sleepiness and both physical and mental health outcomes.

关键词： Academic Performance After-School Activity Bedtime Breakfast Skipping Physical Activity Screen Time Wake Time

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Sleep, Serotonin, and Suicide

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Journal of Behavioral and Brain Science 2012年第4期2卷 471-478页

作者： jun kohyama Tokyo Bay Urayasu/Ichikawa Medical Center Urayasu Japan

The author hypothesizes that sleep loss associated with a decrease in serotonergic activity plays a significant role in attempted suicide. Recent research has emphasized the role of the economic recession on the occurrence of suicide, but with no attention paid to possible biological aspects. In this brief review, the association between sleep, the serotonergic system, and suicide is initially introduced. Then, with consideration of recent research, a hypothesis regarding the oc- currence of suicide is proposed. Finally, based on that hypothesis, three factors possibly germane to reducing suicides (sufficient sleep duration, activation of the serotonergic system, and activation of the prefrontal cortex) are discussed.

关键词： Economic Crisis Prefrontal Cortex C-Fiber Yomikikase Dakko

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Capacity Limitations of Medical Services Provided by Pediatricians in Japan

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Open Journal of Pediatrics 2014年第1期4卷 102-106页

作者： jun kohyama Tokyo Bay Urayasu Ichikawa Medical Center Urayasu Japan

The shortage of pediatricians has been identified as one of the largest social problems in Japan. This study aimed to compare the assumed ideal nighttime working conditions of pediatric hospitalists in Japan with the actual current situation. By using available data on the age-related numbers of pediatricians in Japan, we described the ideal working conditions for pediatric hospitalists in Japan. The ideal situation was then compared with the existing actual working conditions. Compared with the assumed ideal condition, current pediatric hospitalists are working in many hospitals with a few colleagues. To solve the current supply-demand mismatch on medical care for children during night, an involvement of non-pediatric physicians in the medical care of children during the night is indispensable. Also, parents in Japan need to know the limitations relating to the available capacity of pediatricians, and accept that their children can be cared for adequately by non-pediatric physicians, who have been trained to provide primary medical care to children.

关键词： Pediatric Hospitalist Night-Duty Social Needs Non-Pediatric Physician Parents

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Non-School Day Catch-Up Sleep among Pupils in Japan

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Journal of Behavioral and Brain Science（行为与脑科学期刊） 2023年第6期

作者： jun kohyama

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Sleep, Serotonin, and Suicide

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Journal of Behavioral and Brain Science（行为与脑科学期刊） 2012年第4期

作者： jun kohyama

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