New Health Management Service Visualized from "Sleep"
New Health Management Service Visualized from "Sleep"
Sleep Deviation Value by Gender
Compared to the past two years, when lifestyles changed significantly due to the COVID-19 pandemic, this survey, conducted in January 2023, coincided with the easing of infection control measures and a gradual return to normal daily life. Sleep deviation values tended to be higher for women than for men. While men scored higher than women in sleep quality, they scored lower in productivity and stress, which were contributing factors.
《Survey Results》
Men in their 20s have the lowest sleep deviation value,
women aged 60 and above have the highest!
One-way ANOVA showed significant differences in both men and women across age groups (p<0.01).
Changes in Japanese Sleep Duration
According to previous Brain Sleep surveys, the average sleep duration 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 an improving trend with sleep duration increasing by 21 minutes over the past two years. This year's survey found that the average sleep duration in Japan was 6 hours and 43 minutes, a decrease of 5 minutes compared to 2022, returning to the same sleep duration as in 2021.
《Survey Results》
-5 minutes compared to 2022.
Same results as 2021.
*One-way ANOVA confirmed significant differences across all data (p<0.01). Furthermore, a t-test confirmed significant differences in sleep duration compared to the previous year (both p<0.01).
Ranking of Factors Causing Decline in Sleep Quality by Gender
Sleep is essential for a healthy life. Sufficient sleep allows the brain and body to recover from fatigue, leading to vitality the next day. When evaluating sleep, attention is often focused solely on simple quantitative data such as sleep duration, but "quality" plays a crucial role in good sleep. In this survey, out of 10,000 respondents from 47 prefectures nationwide, 4,287 people answered that their sleep quality was "poor" or "very poor," indicating that nearly half of all people in Japan have issues with sleep quality.
《Survey Results》
Work is a top factor for both men and women. For women, hormonal imbalances are a cause.
Relationship Between Productivity and Sleep
It is known that poor sleep quality has a significant impact on work performance and can lead to corporate losses. Many industrial accidents are also said to be caused by lack of sleep or sleep disorders.
《Survey Results》
Productive people have high quality sleep
*One-way ANOVA confirmed significant differences for "sleep duration" and "sleep quality" respectively (p<0.01).
Relationship Between Immunity and Sleep
With the spread of COVID-19 since 2020, the importance of sleep in boosting immunity and enhancing vaccine efficacy has been re-recognized. In this survey, we also investigated the relationship between the number of COVID-19 infections and sleep deviation value to confirm the potential impact of sleep quality on immunity.
《Survey Results》
Immunity is key to sleep quality
*One-way ANOVA confirmed significant differences for "sleep duration" and "sleep quality" respectively (p<0.01).
Relationship Between Work Style (Fixed vs. Shift) and Sleep
This survey also investigated the relationship between work style and sleep.
This survey found that about 10% of all Japanese workers who responded work shifts. While shift work cannot be recommended simply from the perspective of sleep quality, it is also true that modern society cannot function without shift work. Many companies implement shift work for economic efficiency to provide 24-hour services and operate factories 24 hours a day, and their work systems are often decided with economic priorities in mind. Furthermore, jobs essential for public safety and social infrastructure, such as police stations, fire departments, and private security companies, must operate 24 hours a day.
《Survey Results》
Shift work tends to have poor sleep deviation values
*T-tests were conducted for sleep duration and sleep quality, comparing fixed-hour and shift work groups (** : p<0.01).
Brain Sleep can provide various information regarding this survey. Please contact us if you wish to use it.
* When using the content of this survey, please be sure to cite "Sleep Deviation® Survey by Brain Sleep" as the source.
[Survey Outline]
Survey method: Web survey
Target area: Nationwide
Target audience: Men and women
Sample size: n=10,000ss
Survey period: January 2023
* For comparisons of sleep deviation scores and other scores between groups, one-way ANOVA or t-tests were performed, and a significance level of 5% or less was determined to be a statistically significant difference.
* The survey was conducted with some changes in target participants and survey items compared to last year.
This year's survey results confirmed that while there are some fluctuations in Japanese sleep duration, it continues to be longer compared to before the COVID-19 pandemic. The extension of sleep duration due to the COVID-19 pandemic and the accompanying changes in work styles is a global trend, but a decline in sleep quality under remote work conditions is also recognized. It has become clear that a decline in sleep quality not only lowers productivity levels but also increases the risk of COVID-19 infection. It can be said that improving sleep quality is essential during a pandemic.
This survey revealed that women's sleep deviation values tend to be higher than men's of the same age, but unique factors such as hormonal changes and childcare are recognized as contributing to lower sleep quality in women. Also, as has been pointed out before, shift workers tended to have poorer sleep quality compared to those working fixed hours. Given that declining sleep quality reduces productivity and increases disease risk, and that the number of shift workers is increasing year by year, urgent measures are desirable.