Brain Sleep Co., Ltd. (Head office: Chiyoda-ku, Tokyo; Representative Director: Atsushi Hirota; hereinafter "Brain Sleep") will hold "Cloud-like open-air bathing for brain relaxation" at the open-air bathing space on the rooftop of the popular sauna facility "ROOFTOP" (Nishi-Ogikubo, Tokyo). The concept is that "high-quality open-air bathing leads to high-quality sleep." By using the Brain Sleep Pillow, a highly breathable pillow that allows the brain to sleep, and the Brain Sleep Mattress Float during open-air bathing, a higher quality open-air bathing experience and deeper relaxation can be achieved.In addition, a limited-edition set consisting of the Brain Sleep Pillow, the signature product of Brain Sleep, and the "Sauna Pillow" (Brain Sleep Pillow Mini), a mini-sized pillow that supports cooling down during open-air bathing at the sauna and helps achieve deeper relaxation, will be sold. Background of the Initiative Brain Sleep has long focused on bathing and sauna use as methods for "controlling core body temperature," which is important for improving sleep quality. In a study conducted in 2022, it was revealed that sauna use has a positive impact on sleep*1. Furthermore, while there are many things to avoid before bed to improve sleep quality, such as blue light and meals, sauna use is a valuable means that can contribute to improving sleep quality. In particular, open-air bathing after a sauna effectively lowers core body temperature, promoting deeper sleep.However, traditional open-air bathing did not provide sufficient comfort, and the precious relaxation time was not fully utilized. Therefore, by installing the highly breathable Brain Sleep Pillow and Brain Sleep Mattress Float in the open-air bathing space, we aim to efficiently dissipate the heat generated in the sauna and provide an ultimate relaxation experience.In addition, many users of the Brain Sleep Pillow have commented that it feels like "their head is floating." Taking advantage of the rooftop location, we have also prepared creative elements that evoke the sensation of floating on a cloud. ※1 https://prtmes.jp/main/html/rd/p/000000131.000046684.html Initiative Details Brain Sleep will take over the rooftop of "ROOFTOP," a popular sauna facility located a 1-minute walk from Nishi-Ogikubo Station in Tokyo. The Brain Sleep Pillow and Brain Sleep Mattress Float will be installed in the open-air bathing space, providing excellent breathability that efficiently dissipates the heat generated in the sauna, supports relaxation, and allows visitors to experience open-air bathing as if floating on a cloud.Additionally, a Brain Sleep experience space will be set up in the accompanying cafe. Original BRAIN SLEEP x ROOFTOP collaboration stickers will also be distributed for free.Location: ROOFTOP (3-14-7 Nishi-Ogikubo Minami, Suginami-ku, Tokyo)Period: Thursday, October 2, 2025 – Sunday, November 30, 2025Opening hours: 8:00 – 24:00 *Last entry at 23:00 Limited set with a sauna pillow for carrying the ROOFTOP open-air bathing experience is also on sale! Introducing the new "Sauna Pillow," a mini-sized Brain Sleep Pillow that supports cooling down during open-air bathing and helps achieve deeper relaxation. To allow you to recreate the "relaxation" experience at ROOFTOP anytime, a limited-edition set with the Brain Sleep Pillow is now available.Special page: https://brain-sleep.com/pages/sauna_special Product Name: [Sauna Pillow Set for Brain Relaxation] Brain Sleep Pillow + Brain Sleep Pillow MiniPrice: 36,300 yen (tax included) What is the "Brain Sleep Pillow"? In addition to the "golden 90 minutes" when the deepest non-REM sleep occurs, it is crucial to maintain appropriate temperature and humidity within the sleeping environment for good quality sleep. The "Brain Sleep Pillow" uses a unique material that is over 90% air layer, preventing heat and humidity from accumulating during sleep and creating a comfortable sleeping environment.It has also been adopted in the "Relaxation Lounge" in the open-air bathing space of the Osaka/Kansai Expo Sauna "Taiyo no Tsubomi." *2 ※2 https://prtimes.jp/main/html/rd/p/000000246.000046684.html <Product Details>Product Name: Brain Sleep PillowPrice: 33,000 yen (tax included) with pillow coverSizes: Low 60×35×6/8cm, Standard 60×35×9/11cm, High 60×35×12/14cmURL: https://brain-sleep.com/products/pillow Also adopted for Satabi Expo 2025! It has been decided that the "Brain Sleep Pillow" and "Brain Sleep Mattress Float" will be adopted for "Satabi Expo 2025," Japan's first regional experience-based sauna event, which will be held in Awaji Island for three days from Friday, October 3 to Sunday, October 5. Location: AQUA IGNIS Awaji Island (2-28 Yumebutai, Awaji City, Hyogo Prefecture)Period: Friday, October 3, 2025 - Sunday, October 5, 2025Details URL: https://jal-satabi-expo.com/