Brain Sleep Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo, CEO: Atsushi Hirota, hereinafter referred to as "Brain Sleep") has been focusing on the importance of "sleep quality" since its founding as a sleep solutions company, and has been providing products and services to improve sleep quality and disseminating accurate information. Over the past five years, the company has collected various sleep data in Japan, including the "Sleep Standard Deviation Survey," and has now found that "sleep quality" can affect productivity, economic loss, and motivation. It has also been confirmed that sleep measurement can not only improve the quality of nighttime sleep, but also contribute to increasing motivation the next day and increasing daytime activity. The current state of sleep in Japan In the "Sleep Standard Deviation Survey 2024" (hereinafter "the Survey") targeting 10,000 employed people in 2024, the average sleep time in Japan was 6 hours and 50 minutes, the longest in the past five years, and an increase of 23 minutes compared to 2020 when the survey began. However, this is still significantly shorter than the average sleep time of 8 hours and 28 minutes in OECD member countries, and it can be said that Japan's sleep is one of the lowest in the world. Meanwhile, the average sleep quality score has remained almost flat, and there has been no progress in improving sleep quality. The relationship between sleep and work In this survey, when asked whether they felt that sleep affected their productivity, 20.4% answered "strongly," and 49.6% answered "affected," meaning that 70% of people overall felt a connection between sleep and productivity. These results show that there is a widespread awareness that sleep is not simply rest, but is essential for improving daytime performance. This survey also found a correlation between sleep quality and productivity, with people with higher quality sleep tending to be more productive. However, no clear correlation was found between sleep duration and productivity. In this study, sleep quality was correlated with productivity, and people with better sleep quality tended to be more productive. On the other hand, no clear correlation was found between sleep duration and productivity. Similarly, while sleep quality was correlated with economic loss, sleep duration did not. Also, the relationship between mental health and long working hours has been attracting attention, but recent research has reported that long working hours are not the direct cause of worsening mental health, but rather lack of sleep due to long working hours is the cause of worsening mental health. In this survey, we investigated sleep and overtime hours, and found that 66% of people in the A-rank group, who have high sleep quality, worked less than zero overtime, and the percentage decreased the lower the rank. This shows that there is a correlation between overtime hours and sleep quality. Furthermore, in the question about "the number of days when you felt depressed about going to work," the D-rank group, who have low sleep quality, had more days when they felt depressed about work, with 35% answering 5 days or more a week, while 70% of the A-rank group, who have high sleep quality, answered 0 days a week. These results suggest that "sleep quality" may also affect mental health. Sleep and lifestyle Next, in a survey on pre-bedtime habits, the results of a comparison between the high and low quality sleep groups revealed that the high quality sleep group engaged in habits that hindered sleep quality less frequently. The following four points showed significant differences. - Looking at computer, smartphone or tablet screens before going to bed - Sleeping with the TV or lights on Drinking alcohol before going to bed - Always going to bed at different times The effect of sleep measurement on behavioral change Brain Sleep will begin selling the wearable device "Brain Sleep Coin" that measures sleep to the general public in October 2022. With Brain Sleep Coin, "Sleep Coins" are accumulated every time you measure your sleep, and your membership rank increases. We compared the "sleep scores" for each membership rank and found that the higher the membership rank (the more measurements taken), the higher the sleep score. In addition, in this survey, we interviewed users about the changes they experienced since they started using the Brain Sleep Coin. The results showed that many users experienced a positive change in their morning mood after starting to use the Brain Sleep Coin. In addition, when we looked at the changes in sleep scores of those who participated in this questionnaire survey and who themselves felt that their sleep quality had improved, we found that with continued measurement, the proportion of deep sleep in the first 90 minutes of sleep, which is important for sleep quality, gradually increased. These results suggest that measuring sleep allows people to understand their own sleep patterns and change their behavior based on the results, which may improve the quality of their sleep. Comment from Seiji Nishino / Chief Research Advisor of Brain Sleep, author of "The Stanford Way to Get the Best Sleep" The average sleep time in Japan, the country with the worst sleep in the world, is gradually increasing. Attention to "sleep quality" is also increasing, and many products to improve sleep quality are on the market, but there is no evidence of an improvement in sleep quality yet. The "Work Style Reform Act," which has been gradually implemented since April 1, 2019, aims to improve Japan's labor productivity, which is low compared to the rest of the world. However, Brain Sleep's survey showed that people who have "high quality sleep" tend to be more productive than those who have "long sleep times." In addition, people with high quality sleep also tend to be more motivated, so it is important to work on improving sleep quality not only from the perspective of economic profit but also well-being. We believe that by raising awareness of sleep not only among individuals but also among companies and society as a whole and improving the quality of sleep, Japan as a whole will move in a better direction. ■ What is the sleep deviation survey? Brain Sleep has been conducting a sleep survey every January since 2020, targeting 10,000 participants (allocated by gender, age, and prefecture) across all 47 prefectures in Japan. Sleep Standard Deviation® Survey Results Page https://brain-sleep.com/service/sleepdeviationvalue/research2024/ ■What is Brain Sleep Coin? A wearable device that uses a unique measurement algorithm developed based on data accumulated through sleep research. By using the device in conjunction with an app, more personalized analysis can be performed according to your sleeping position.
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