Brain Sleep Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; CEO: Atsushi Hirota; hereinafter referred to as "Brain Sleep"), in collaboration with Super Hotel Co., Ltd. (CEO: Kensaku Yamamoto; Headquarters: Osaka City, Osaka Prefecture), which operates hotels that are kind to both the earth and people under the concept of "Natural, Organic, Smart," conducted the first joint sleep survey targeting 10,000 experts from all 47 prefectures in Japan. Survey results page : https://brain-sleep.com/service/sleepdeviationvalue/research2024/ Survey results summary Super Hotel, in collaboration with Brain Sleep, conducted a survey on sleep environments and sleep habits targeting 10,000 employed people (allocated by gender, age, and prefecture) in all 47 prefectures in Japan. The purpose of this survey is to understand what kind of sleep environment leads to good quality sleep by analyzing the "sleep deviation score" that evaluates sleep state, which is composed of various questions about sleep by Brain Sleep, combined with sleep environment and sleep habits. The sleeping environments analyzed in this study are as follows: 1. Bedroom color 2. Bedroom habits 3. Humidity environment in the bedroom Based on the data on the sleeping environments of the 10,000 people obtained in this joint survey, Super Hotel plans to carry out various activities in the future to provide its guests with an even better "sound sleeping environment," and Brain Sleep will support these activities from the perspective of sleep medicine. Comment from Seiji Nishino: Chief Research Advisor of Brain Sleep, author of "The Stanford Method for Better Sleep" Sleep is sometimes described as "fragile" and is greatly affected by external environments such as the bedroom. It is known that the room temperature, humidity, and lighting in the bedroom also affect the state of sleep, but although there have been reports of studies on the color of the bedroom in other countries, there have been no studies in Japan. This time, Brain Sleep and Super Hotel conducted a joint survey on sleep environments and sleep habits, and found that people who sleep in white bedrooms tend to sleep better, followed by brown and beige. On the other hand, people who sleep the worst in red bedrooms tend to work long hours, work or study in their bedrooms, and drink alcohol or exercise heavily before going to bed. It was also found that people who sleep in blue bedrooms tend to enjoy entertainment on their smartphones and tablets. While it is necessary to determine whether this is cause or effect, it is interesting to note that this result shows that sleeping in bedrooms with natural colors that blend in with nature leads to better sleep for Japanese people. Seiji Nishino Professor of Psychiatry at the Stanford University School of Medicine and Director of the Stanford University Sleep and Biorhythm Research Center Founder and Chief Research Advisor, Brain Sleep Inc. Doctor, Medical Doctor Certified Qualifications: Mental Health Designated Physician, Japan Society of Sleep Research Specialist, Industrial Physician 1. The relationship between bedroom color and sleep: A white bedroom is recommended for improving sleep quality This survey found that white was the most popular bedroom color at 36%, followed by off-white (cream), beige, and brown at around 10%, indicating that many people choose calm colors. In particular, men are more likely to have a white-based bedroom compared to women, and when looking at the trends for other colors by gender and age, women are more likely to choose green and pink than men, while men (especially younger people) are more likely to choose black than women. When it comes to sleep, it turns out that people who sleep in white bedrooms get the best sleep. They had the highest sleep quality score of 73.58, and the average sleep time was 6 hours and 50 minutes, which was the average for the 10,000 people. Brown and beige were the next best in terms of sleep quality. A survey of 2,000 people conducted in the UK in 2013 showed that blue is the best color for sleep. In addition, color therapy and holistic interior consultant Susie Chiazzari said that the color of the bedroom interior definitely affects the quality and quantity of sleep during the night, so it is worth considering the color of the bedroom interior. In a recent survey of 10,000 Japanese people conducted by Brain Sleep and Super Hotel, people who slept in blue bedrooms (navy, light blue, aqua, blue, turquoise) scored higher on their sleep quality than those who slept in white or brown bedrooms. It was also interesting to note that there were differences between countries. 2. Bedroom activities: People whose bedrooms are red tend to work or study, while those whose bedrooms are blue tend to kill time on their smartphones. The top three most common bedroom activities all involve using a smartphone or tablet. The most common activity was "SNS/Internet surfing" at 41.3%, followed by "watching videos" and "playing games". Meanwhile, 22.9% of people answered that they do nothing in their bedroom other than sleeping. When looking at sleep quality, those with better quality sleep were more likely to say they "didn't do anything in the bedroom other than sleep," while those with worse quality sleep were more likely to do a variety of tasks and have fun. This tendency was particularly evident among people who used smartphones or tablets. In addition, when looking at bedroom activities according to sleep duration, people who slept longer tended to be more likely to "talk with family, partners, and friends." Additionally, we found some distinctive trends in bedroom behavior depending on the bedroom color. The most notable feature was that the bedroom color was red, and the proportion of people using it for "working," "studying," and even "eating and drinking" was higher than for other colors, while the proportion of people using their smartphones or tablets for social media/surfing the internet, "watching videos," and "games," which were activities that many people generally did, tended to be lower. Other color-specific behavioral characteristics are as follows: Blue (navy/light blue/blue, etc.): High percentage of people who enjoy entertainment on smartphones and tablets Pink: Online shopping and phone calls (including video calls) Yellow: Reading (paper and digital) Grey: conversations with family, partners, and friends Silver: Similar to the UK results, exercise, listening to music and studying White/beige/brown: no outstanding features 3. Bedroom humidity environment: Most people do not use humidity control devices when sleeping except in summer. People with poor quality sleep tend to set the humidity low. Humidity in the sleeping environment, like temperature, has a significant impact on sleep. When we investigated the use of humidity control devices in the bedroom when sleeping by season, we found that while about 76% of people use them in the summer, which is a humid environment, less than 50% of people do not use them in spring, autumn, or winter, indicating that humidity control is not done much while sleeping. In particular, more than 70% of people do not use them in spring. Even among those who use humidity control devices to set the humidity, roughly 50% responded that they use humidity conditions other than those recommended for sleep (spring/summer: 50-60%, autumn/winter: 40-50%) or were unsure of their humidity setting, indicating a low percentage of people who consciously try to maintain an appropriate humidity level. Looking at the relationship between humidity and sleep, people with extremely short (less than 4 hours) or long (9 hours or more) sleep times, as well as people with poor quality sleep (sleep quality rated D), tended to have lower humidity settings. From the perspective of sleep science, it is considered ideal to maintain appropriate humidity, but in this survey, people who did not use humidity control devices tended to have better quality sleep, even though they slept less. This suggests that people who have trouble sleeping may be particular about their sleeping environment in order to improve the quality of their sleep, so Super Hotel will continue to conduct further verification in the future using actual guest rooms. Sleep Standard Deviation® Survey Results Page In addition to overall sleep, in 2024 we focused on the sleep environment. In addition to the announced content, we can provide data such as who you sleep with, temperature and humidity, sleeping environment preferences, bathing methods, etc. by industry, occupation, gender, age, and region. *When using the content of this survey, please be sure to cite "Sleep Standard Deviation Score® 2024 Brain Sleep Survey" as the source. https://brain-sleep.com/service/sleepdeviationvalue/research2024/ [Survey Overview] Survey method: Web survey Target area: Nationwide Target conditions: Male and female Sample size: n=10,000ss Survey period: January 2024 *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. ■What is Sleep Standard Deviation®? This system creates a set of questions that quantify the subjective evaluation of sleep from a wide range of perspectives, including subjective symptoms related to sleep and sleep habits, and then quantifies the results as a "standard deviation" that is familiar to Japanese people, making it possible to grasp the relative sleep status of Japanese people as a whole. We are developing it as a research field for the verification and evaluation of sleep-related products and services, and as a corporate health management service called "Sleep Standard Deviation for Biz." It can be widely used as a subjective evaluation of sleep. Brain Sleep Corporate Consulting: https://brain-sleep.com/corporate/corporate_consulting/ [Super Hotel Co., Ltd.] Established: December 1989 Address: 1-7-7 Nishihonmachi, Nishi-ku, Osaka City, Osaka Prefecture Representative Director: Kensaku Yamamoto Official website: https://www.superhotel.co.jp/ Appendix 2. Bedroom behavior 2-1. Bedroom behavior × bedroom color 2-2. Bedroom behavior × sleep time/sleep quality rank 3. Humidity settings for humidity control devices when sleeping by age group
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