Brain Sleep Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; Representative Director: Kosuke Michibata; hereinafter "Brain Sleep") has announced Japan's first "Sleep Deviation Score" based on a survey of 10,000 people (10,343 people allocated by gender, age, and prefecture) across all 47 prefectures. This score not only directly assesses sleep conditions such as individual sleep habits but also workplace productivity, stress levels, and the risk of sleep apnea syndrome (SAS). Moving forward, this survey will be utilized for various activities aimed at resolving the issue of sleep debt faced by the Japanese people, who have the shortest sleep duration in the world. Survey Results SummaryBased on various survey results related to sleep, the first "Sleep Deviation Score" in Japan was constructed. The ranking of deviation scores revealed significant differences in lifestyle habits such as "diet, smoking, drinking, and environment" between the top 1,000 (top 10%) and worst 1,000 (bottom 10%) participants.Furthermore, the following five items also revealed characteristics of Japanese sleep:1. Sleep duration2. SAS risk3. Nap awareness4. Prefectural ranking5. Occupational and age-group ranking1. Sleep Duration: Japan's Sleep Breakdown Revealed According to a 2018 survey by the OECD and others, the average sleep duration for Japanese people was 7 hours and 22 minutes, the shortest in the world. With the rise of a 24-hour society, sleep duration has further shortened in recent years, and a recent Ministry of Health, Labour and Welfare survey reported that Japanese people sleeping less than 6 hours accounted for 40% of the total population. This current survey revealed that the average sleep duration for Japanese people is 6 hours and 27 minutes, which is 55 minutes shorter than the OECD's reported value. It can be said that Japan is not only accumulating "sleep debt" but is also heading towards a complete breakdown of sleep.2. SAS Risk: 22% of People Have a High Risk of Sleep Apnea Syndrome (SAS)Sleep apnea syndrome is a condition where "apnea" (cessation of breathing) repeatedly occurs during "sleep," disrupting sleep. There is a terrifying statistic that if one suffers from moderate to severe SAS (15 or more breathing cessations per hour), the risk of myocardial infarction or cerebral infarction is 2 to 4 times higher than normal, and approximately 40% of those who leave it untreated die within about 8 years. This survey found that 22% of the Japanese population has a high risk of sleep apnea syndrome. As previously reported, people with a tendency towards obesity have a significantly higher risk of SAS. Furthermore, it was also found that the average sleep duration for people with a high SAS risk was 6 hours and 17 minutes, which is significantly shorter compared to the average sleep duration of 6 hours and 30 minutes for those without such a risk. 3. Nap Awareness: 67% of Japanese People Desire NappingThe proportion of people who feel sleepy during the day and desire to nap was high across all age groups, reaching 67% of the total population, with a particularly higher tendency observed in those aged 20s to 40s. Even for individuals without sleep disorders, taking a nap can be effective if they feel sleepy during the day. A nap of about 20 minutes until around 3 PM tends to have no impact on the quality of nighttime sleep and is likely to effectively alleviate daytime sleepiness. There are also reports that people who take naps of less than 30 minutes have about one-sixth the incidence of dementia compared to those who do not have a napping habit. 4. Prefectural Ranking: 1st Aomori Prefecture, 47th Miyagi PrefectureThere were no significant differences in sleep deviation scores across prefectures (52.21-48.35), suggesting that sleep issues among Japanese people are a nationwide problem. Regarding regional differences, Aomori Prefecture, ranked 1st, was found to have many people who rarely feel sleepy during the day due to good sleep quality and habits. Furthermore, their sleep duration was the third longest nationwide. On the other hand, Miyagi Prefecture, ranked last, did not notably stand out for short sleep duration, but showed poor tendencies in sleep habits, health status, and stress levels. It also had the highest number of people at risk of sleep apnea syndrome, one of the sleep disorders, nationwide. 5. By Age and Occupation: Young Entrepreneurs' Sleep is at RiskLooking at all age groups and occupations, individuals engaged in construction and mining had the lowest sleep deviation score at 43.83, followed by professional drivers, one of the occupations with many accidents during working hours involving sleep deprivation, with a sleep deviation score of 44.64, which was also found to be low. Particularly, professional drivers in their 20s showed a very poor tendency with a sleep deviation score of 38.93. The decline in performance due to sleep problems in these occupations can lead to major industrial accidents, so further detailed analysis will be conducted. Furthermore, there was a significant difference in the sleep deviation score of "company presidents/executives" by generation. While company presidents/executives in their 50s-60s had a higher-than-average sleep deviation score of 50.16, company presidents/executives in their 20s had the lowest sleep deviation score overall at 35.77. In terms of sleep duration, it was 5 hours and 32 minutes, which is 1 hour and 50 minutes shorter compared to the average of 7 hours and 22 minutes found in the OECD (2018) survey. ■Sleep Deviation Score WEB page:https://brain-sleep.com/sleep-deviation/ Brain Sleep can provide various information regarding this survey.What is the Sleep Deviation Score?Survey method: Web surveyTarget area: NationwideTarget audience: Men and womenSample size: n=10,343sSurvey period: December 2019*For percentage comparisons, χ2 (chi-squared) tests were performed for frequency, and t-tests were performed for comparisons of sleep deviation scores between groups. A significance level of 5% or less was determined to be a statistically significant difference and recorded.▼Items used to calculate the "Sleep Deviation Score"▼■Lifestyle habits → Diet, exercise habits, etc.■Productivity → Daytime sleepiness and working hours, nap awareness, etc.■Stress → Simple stress check■Sleep quality → Sleep environment and pre-sleep behavior, etc.■SAS risk → Snoring, blood pressure, heredity, etc.*The above items are aggregated using a proprietary algorithm.For Japanese people to live "the happiest life with the best sleep"With the vision of "Sleep Revolution to Eliminate Sleep Debt" and the slogan "The best sleep for the happiest life," we aim to help people live "the happiest life" by achieving "the best sleep." While sleep plays a crucial role linked to various diseases, there has been no method to visualize sleep quality. Therefore, we have established a deviation score standard to visualize Japanese sleep through our unique survey method. We will utilize this as an opportunity to promote activities that lead to individual sleep improvement, health management, and ultimately, the performance improvement of employees in companies. We hope to continue moving forward, wishing that all Japanese citizens can live "the happiest life with the best sleep."Seiji Nishino Doctor of Medicine, Professor of Psychiatry at Stanford University School of Medicine, Director of the Stanford University Sleep & Circadian Neurobiology Laboratory, Founder of Brain Sleep Co., Ltd., Certified Psychiatrist, Certified Sleep Specialist by the Japanese Society of Sleep Research【Brain Sleep Co., Ltd.】Brain Sleep was established in May 2019 by Seiji Nishino, Director of the Stanford University Sleep & Circadian Neurobiology Laboratory, with the slogan "The best sleep for the happiest life." We primarily provide sleep consulting to companies specializing in sleep, services utilizing IT, and disseminate scientifically-backed sleep information. We aim to eliminate the sleep debt of Japanese people, who have the shortest sleep duration in the world, and improve their quality of life.*This is a venture company invested in by ANGFA Co., Ltd., a preventative medicine company. Established: May 2019Representative Director: Kosuke MichibataLocation: JP Tower 26F, 2-7-2 Marunouchi, Chiyoda-ku, TokyoHP:https://brain-sleep.com/【Click here for the press release PDF file】
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