New Health Management Service "Visualizing from Sleep"
New Health Management Service "Visualizing from Sleep"
- Changes in Japanese Sleep Duration
- Relationship between Productivity (Economic Loss) and Sleep
- Relationship between Days Feeling Down About Going to Work and Sleep Quality
- Characteristics of Sleep Deviation Value TOP 1000 and WORST 1000
- [Joint Research with Super Hotel Co., Ltd.] Relationship between Bedroom Color and Sleep
- [Joint Research with Super Hotel Co., Ltd.] Behavioral Habits in the Bedroom
- [Joint Research with Super Hotel Co., Ltd.] Humidity Environment in the Bedroom
Changes in Japanese Sleep Duration
The average sleep duration for 10,000 working individuals in 2024 was 6 hours and 50 minutes, the longest recorded in the past five years of surveys. Compared to 2020 when the survey began, sleep duration has increased by 23 minutes, but it is still overwhelmingly shorter than the average sleep duration of 8 hours and 28 minutes in OECD member countries, indicating that Japanese sleep remains at one of the lowest levels globally. Furthermore, when asked about ideal sleep duration, it was found to be 7 hours and 40 minutes, a difference of 50 minutes from actual sleep duration.
《Survey Results》
Up 7 minutes compared to 2023.
50 minutes difference from ideal sleep duration.
*One-way ANOVA was performed on all data, and significant differences were confirmed (p <0.01). For comparison of sleep duration with the previous year, a t-test with Bonferroni correction was performed, and significant differences were confirmed (p<0.01 for both).
Relationship between Productivity (Economic Loss ※1) and Sleep
Recent reports indicate that poor sleep quality significantly impacts job performance and leads to corporate losses. Many industrial accidents are also said to be caused by sleep deprivation or sleep disorders.
In this survey, we re-examined the relationship between productivity and sleep. 70.0% of respondents answered "strongly affects" or "affects" to the question "Does sleep affect your productivity?", indicating a growing understanding of the relationship between sleep and productivity.
《Survey Results》
Poor sleep quality leads to higher economic losses
※1
Economic loss: Calculated by multiplying the reported productivity value (0-100%) by annual income.
Sleep quality (rank): Responses to original questions were scored and then converted into four ranks: A-D.
A: No issues B: Mild issues C: Issues D: Needs improvement
Relationship between Days Feeling Down About Going to Work and Sleep Quality
The relationship between mental health and long working hours has long been a focus, but recent research reports that long working hours are not a direct cause of mental health deterioration; rather, sleep deprivation resulting from long working hours causes mental health deterioration ※2.
《Survey Results》
People with poor sleep quality feel more down about going to work
*Multiple comparisons using Games-Howell method confirmed significant differences between 0-1 days and 1-2 days (p <0.01 for both).
※2 Tenshi Watanabe, et al. https://www.mdpi.com/1660-4601/19/11/6715
Characteristics of Sleep Deviation Value TOP 1000 and WORST 1000
When comparing the top 1000 and bottom 1000 individuals in sleep deviation value across sleep duration, sleep quality, sleep habits, and work styles, distinct characteristics were observed in many aspects.
《Survey Results》
*t-test performed and significant difference confirmed (p <0.01)
This year's survey results again show an increasing trend in Japanese sleep duration, with 2024 sleep duration increasing by 23 minutes compared to 2020. However, it was observed that sleep duration is still 1 hour and 38 minutes shorter than the average sleep duration of OECD member countries, and approximately 50 minutes longer sleep is considered ideal. 70% of people feel that sleep affects their productivity, and it was found that the economic loss for those without sleep quality issues is 890,000 yen per year, while for those needing improvement, it is 1,650,000 yen per year, a difference of 760,000 yen. People with poor sleep deviation values are characterized by short sleep duration and poor sleep quality, but many of them have long total working hours due to overtime, and an extremely high rate of smartphone use before bedtime. To improve corporate labor productivity, it has become clear that issues to be addressed by the company as a whole, such as reducing overtime work, are necessary, in addition to improving individual lifestyle habits.
This year's survey also included a joint study with Super Hotel, which found that people sleeping in white bedrooms had better sleep, followed by brown and beige. On the other hand, the worst sleep was observed in people sleeping in red bedrooms, who tended to have long working hours, often worked or studied in their bedrooms, and frequently consumed alcohol or engaged in strenuous exercise before bedtime. While it is necessary to determine whether this is a cause or effect, it is interesting that this study found that sleeping in natural-colored bedrooms harmonious with nature leads to better sleep for Japanese people.