A new health management service that visualizes sleep
A new health management service that visualizes sleep
Gender-specific sleep deviation scores
Compared to the past two years, when lifestyles have changed dramatically due to the COVID-19 pandemic, this survey was conducted in January 2023 at a time when infection control measures were being relaxed and daily life was beginning to return to normal. Women tended to have higher sleep deviation scores when compared by gender. This was because men scored higher than women in the quality of sleep category, but had lower results in the productivity and stress categories.
Survey results
Men in their 20s have the lowest sleep deviation score,
Women over 60 years old are the most likely!
A one-way analysis of variance was performed for men and women by age group, and significant differences were confirmed (p<0.01).
Changes in sleep time in Japan
Previous Brain Sleep surveys have shown that the average sleep time in Japan was 6 hours and 27 minutes in 2020, 6 hours and 43 minutes in 2021, and 6 hours and 48 minutes in 2022, showing a trend of improvement with sleep time increasing by 21 minutes over the past two years. In this year's survey, the average sleep time in Japan was 6 hours and 43 minutes, 5 minutes shorter than in 2022, returning to the same sleep time as in 2021.
Survey results
Compared to 2022, that's -5 minutes.
Same results as in 2021
*A one-way analysis of variance was performed on all data and significant differences were confirmed (p<0.01). In addition, a t-test was performed to compare sleep time with the previous year and significant differences were confirmed (both p<0.01).
Ranking of causes of poor sleep quality by gender
Sleep is essential for people to live a healthy life. Getting enough sleep helps the brain and body recover from fatigue, leading to energy the next day. When evaluating sleep, attention is often focused only on simple quantitative data such as sleep time, but "quality" plays an important role in good sleep. In this survey, out of 10,000 respondents from all 47 prefectures across Japan, 4,287 people answered that their sleep quality was "poor" or "very poor," indicating that nearly half of the people in Japan have issues with their sleep quality.
Survey results
Work ranks high for both men and women. For women, hormonal imbalance is the cause.
The relationship between productivity and sleep
It is known that poor sleep quality has a significant impact on work performance and leads to losses for companies. Many industrial accidents are said to be caused by lack of sleep or sleep disorders.
Survey results
Productive people sleep better
*One-way analysis of variance was performed on "sleep time" and "sleep quality," and significant differences were confirmed (p<0.01).
The relationship between immunity and sleep
With the COVID-19 pandemic since 2020, the importance of sleep in improving immunity and increasing the effectiveness of vaccines has been recognized once again. In this survey, we also investigated the relationship between the number of COVID-19 infections and sleep deviation score to confirm the possibility that sleep quality affects immunity.
Survey results
The key to immunity is quality of sleep
*One-way analysis of variance was performed on "sleep time" and "sleep quality," and significant differences were confirmed (p<0.01).
The relationship between work style (fixed vs. shift) and sleep
This survey also looked into the relationship between work style and sleep.
This survey also found that around 10% of all employed Japanese respondents engaged in shift work. While shift work cannot be recommended simply from the perspective of whether it is good or bad sleep, it is also true that modern society could not be supported without it. Many companies have introduced shift work for economic efficiency in order to provide 24-hour services or operate factories 24 hours a day, and it is thought that these work systems are often decided with economic priority. Additionally, jobs that maintain public order and social infrastructure, such as police stations, fire stations, and private security companies, must also operate 24 hours a day.
Survey results
Shift workers tend to have poor sleep deviation scores
* A t-test was conducted on the sleep duration and quality of sleep between the fixed-time and shift-time groups (**: p<0.01).
Brain Sleep can provide various information related to this survey. Please contact us if you would like to use this information.
*When using the content of this survey, please be sure to cite "Sleep Standard Deviation® Brain Sleep Survey" as the source.
[Survey Overview]
Survey method: Web survey
Target area: Nationwide
Eligibility: Male and female
Sample size: n=10,000ss
Survey period: January 2023
*When comparing sleep deviation values and scores between groups, one-way analysis of variance or t-tests were performed, and differences with a significance level of 5% or less were determined to be statistically significant and are reported here.
*This survey has changed some subjects and survey items from last year.
This year's survey results confirmed that, although there has been some fluctuation, sleep times in Japan continue to increase compared to before the COVID-19 pandemic. The increase in sleep times due to the COVID-19 pandemic and the resulting changes in work patterns is a global trend, but it is also recognized that sleep quality is declining, especially during remote work. It has become clear that declining sleep quality not only reduces productivity levels, but also increases the risk of COVID-19 infection. It seems that it is especially important to make an effort to improve the quality of your sleep during a pandemic.
In this survey, women's sleep deviation scores tended to be higher than men of the same age, but it is recognized that factors specific to women, such as changes in hormone balance and childcare, reduce women's quality of sleep. As has been pointed out before, shift workers also tend to have poorer sleep quality than those with fixed hours. Given that poor sleep quality reduces productivity and increases the risk of illness, and that the number of shift workers is increasing year by year, immediate measures are needed.