Sudden Autumn Chill Follows Prolonged Summer Heat Just when we thought the humid, intense heat and lingering summer heat would never end, autumn's coolness and dry air arrived abruptly. The influenza season was announced a month earlier than in 2024. With many still suffering from summer fatigue, it's more important than ever to manage one's health. Summer 2025 recorded the highest temperatures in Japan's observed history. However, after such record-breaking heat, seasonal transitions are prone to rapid changes in temperature and atmospheric pressure, placing a greater burden on the body. Due to recent climate change, these fluctuations have become even more extreme. In the past month (September 8 - October 7, 2025), there were 23 days out of 30 – approximately 80% of the time – where the daily temperature difference was 7℃ or more, indicating a period of highly volatile temperatures. ＜Daily Maximum Temperatures in Tokyo from September 8 to October 7, 2025＞ ※1 Japan Meteorological Agency Seasonal Average Temperatures for Japan https://www.data.jma.go.jp/cpdinfo/temp/sum_jpn.html What is "Temperature Difference Fatigue" to Watch Out for During Seasonal Transitions? Temperature difference fatigue refers to "a state where the autonomic nervous system overworks due to sudden temperature changes, causing the body to expend energy and accumulate fatigue." Generally, it is said that physical ailments tend to appear when the temperature difference exceeds 7℃, and the greater the temperature difference, the higher the risk of falling ill. The human body has a function called "homeostasis" that maintains a constant body temperature despite environmental changes, and the autonomic nervous system is responsible for this function. When hot: Blood vessels expand, increasing blood flow and lowering body temperature through sweating.When cold: Blood vessels constrict, reducing blood flow and preventing body heat from escaping. When sudden temperature changes occur, the autonomic nervous system frequently needs to perform these adjustments, leading to massive energy consumption and accumulated fatigue, resulting in various ailments. ※2 Physical fatigue: General fatigue, malaise Load on specific parts of the body: Stiff shoulders/neck, sensitivity to cold, gastrointestinal disorders, swelling These also contribute to poor sleep quality. When experiencing temperature difference fatigue, the symptoms can worsen sleep quality, leading to a vicious cycle where rest becomes elusive. One of the main roles of sleep is to "rest the brain and body." Let's alleviate the body's burden through fatigue recovery and improve sleep quality. ※2 Japan Association for the Prevention of Adult Diseases (NPO) https://www.japa.org/tips/temperature_difference_fatigue/ Beyond just "sleep" — Fatigue recovery during sleep contributes to "restorative sleep"! Recently, "restorative sleep" — how refreshed one feels after sleep — has gained attention as an expectation of "sleep." To achieve "restorative sleep," physical fatigue recovery is essential. Insufficient fatigue recovery results in feeling tired even after sleeping.Due to diverse lifestyles and daily fluctuations in temperature and atmospheric pressure, more and more people are experiencing fatigue that traditional sleep alone cannot address, such as the burden on the body due to "homeostasis" and reduced autonomic nervous system regulation due to lack of exercise. Four types of items available! The "Brain Sleep Recovery" series efficiently promotes fatigue recovery during sleep The "Brain Sleep Recovery" series features a unique recovery material called "MEDIC RECOVERY FIBER." This fabric is uniquely developed by blending several carefully selected high-purity ceramics made from natural minerals and kneading them into the fibers at a high concentration. Its special yarn shape enhances body heat absorption and far-infrared radiation, effectively warming the body, promoting blood circulation, and achieving high recovery effects. While there are many external temperature changes, such as day-night temperature differences, sudden drops in temperature after intense heat, and indoor-outdoor temperature variations, simply putting on or taking off clothes cannot completely control body temperature. "MEDIC RECOVERY FIBER" helps increase blood flow and maintain a constant body temperature while worn. Minimizing changes in body temperature regardless of sudden external temperature fluctuations and reducing the burden on the autonomic nervous system not only promotes fatigue recovery but also prevents fatigue. Highly Recommended Now That It's Getting Chilly! Efficiently Recovers Fatigue During Sleep by Regulating Body Temperature "Brain Sleep Wear Recovery" and "Brain Sleep Light Comforter Recovery" This time, we introduce two items from the "Brain Sleep Recovery" series that are particularly recommended for autumn, when sudden temperature changes are felt. Instead of relying solely on heating, let's improve blood circulation in the body and regulate body temperature in a way that is less affected by the environment. ◆PICK UP ITEM ① Product Features of "Brain Sleep Wear Recovery" Simply by wearing it to sleep, it delivers four benefits: "fatigue recovery," "blood circulation promotion," "reduction of muscle stiffness," and "alleviation of muscle fatigue." Made from a lighter sweat fabric than general sweat fabrics, it also reduces the burden on the body. The fabric has excellent moisture absorption and release properties, providing a comfortable, non-stuffy feel and comfortable mobility that does not interfere with sleep. ◆PICK UP ITEM ② Product Features of "Brain Sleep Light Comforter Recovery" It features an exquisite texture that you'll want to be wrapped in forever. The cashmere blend side has a smooth, cashmere-like feel, while the cotton blend side has a crisp, cotton-like texture. When placed under a duvet, it increases the temperature by 6℃. It maintains an ideal bedding humidity of 50±5% over time. The entire blanket absorbs and releases moisture, creating a comfortable, non-stuffy environment. It is also machine washable at home.
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