Long lingering summer heat and sudden coolness in autumn 2025. How do temperature fluctuations affect sleep? The summer of 2025 saw record-breaking heat in Japan. The intense heat continued into September, and according to the latest forecast from the Japan Meteorological Agency, unseasonable residual heat is expected to persist until mid-October. In late September, temperatures in Tokyo finally dipped below 30°C on some days, and many people are likely rushing to change their clothes, feeling the sudden crispness of autumn.After a prolonged period of residual heat, a rapid change in temperature is occurring. The autumn rain front, which forms at the boundary between summer and autumn air, tends to linger, and it is predicted that the number of days with sudden coolness due to rain will increase. To avoid getting sick due to temperature differences, it is necessary to be more careful about temperature fluctuations this autumn than in previous years. *1 *1 Mid-October will still see midsummer days – tenki.jp https://tenki.jp/forecaster/gureweather/2025/09/18/35786.html Is autumn to winter a chance to improve your sleep? The three important elements for sleep are "sleep rhythm," "quantity of sleep," and "quality of sleep." Maintaining the balance of these elements is key to getting good quality sleep. In summer, these three sleep elements tend to be disturbed by heat and humidity. As the weather cools down and the sunrise gradually gets later, it becomes easier to secure sleep time without being woken up by the morning sun. Compared to summer, when the sun rose early and there were many factors like heat and humidity that could wake you up, this is an excellent time to adjust your sleep rhythm and get high-quality sleep. Now that the heat has subsided, regulating your sleep rhythm will lead to good quality sleep in the cold winter. Autumn, the season of food, has arrived! Improving sleep quality through diet While there are various ways to improve sleep quality, incorporating foods good for sleep into your daily diet is one of the easiest ways to do so. With many seasonal ingredients available in autumn, why not try incorporating foods that promote sleep? This time, we will introduce three ingredients that enhance sleep quality and the foods that contain them. Recommended for the changing seasons! Automatic temperature regulation with temperature control technology developed for spacesuits "Brain Sleep Wear Thermo Control" "Brain Sleep Comforter All Seasons" Introducing two automatic temperature control items that utilize Outlast's temperature control technology, developed for spacesuits. Microcapsules change with temperature fluctuations, absorbing, storing, and releasing heat, allowing you to stay cool when it's hot and warm when it's cold, making them versatile items. These items are recommended for the changing seasons and times of large temperature fluctuations. "Brain Sleep Wear Thermo Control" Product Features It brings your skin surface temperature closer to 32°C ±1, which is considered comfortable. The original fabric uses absorbent cotton and highly moisture-absorbent rayon, creating a gentle pile fabric that is resistant to wrinkles. We also paid attention to comfort. The top has thumbholes, allowing you to cover your hands when it's cold, and the pants have adjustable stoppers to adjust the hem length. Product name: Brain Sleep Wear Thermo ControlSizes: S, M, L, XLPrice (tax included): Tops, pants 12,800 yen eachURL: https://brain-sleep.com/products/wear_thermocontrol "Brain Sleep Comforter All Seasons" Product Features An automatic temperature control light comforter (duvet) with Outlast filling. One side uses soft peach skin fabric, and the other side uses cool-touch fabric, allowing you to choose the comfortable side depending on the season and temperature. Since it can be used reversibly throughout all four seasons, it requires no storage and is machine washable. It's a clean, cover-free comforter that will be useful all year round. Product name: Brain Sleep Comforter All SeasonsPrice (tax included): Single 19,800 yen, Semi-double 25,300 yen, Double 30,800 yen, Queen 39,600 yenURL: https://brain-sleep.com/products/comforter_allseasons
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