BrainSleep Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; Representative Director: Atsushi Hirota; hereinafter "BrainSleep"), in collaboration with Super Hotel Co., Ltd. (Headquarters: Osaka, Osaka Prefecture; President: Kensaku Yamamoto; hereinafter "Super Hotel") and Associate Professor Sawako Uemura of Akita University Graduate School of Medicine (hereinafter "Akita University"), will commence a study to verify the sleep-enhancing effects of natural hot springs installed in hotels. Background of this Initiative Hotel stays involve spending a significant portion of time sleeping. There is a strong demand for better sleep than usual, and various sleep-related services are currently available. At the request of Super Hotel, we will collaborate with Associate Professor Sawako Uemura of Akita University, a leading researcher in hot springs and bathing, to verify whether hotel natural hot springs are effective in improving sleep.Super Hotel established "Gussuri Lab" (Sound Sleep Lab) based on the philosophy of helping guests achieve "sound sleep" and start the next day refreshed and ready. As part of this initiative, natural hot springs have been introduced in each branch for health and comfortable sleep. While it has been demonstrated that chloride springs and artificial carbonated springs are effective in promoting sleep in healthy adults, based on core body temperature and brain waves, the effect of simple hot springs on sleep has not been studied. If the results of this study prove the effectiveness of natural hot springs, it could be a promising solution to sleep issues. Study Overview This study will investigate the effect of natural hot springs within hotels on sleep using the following methods:Subjects: 18 healthy men and womenMeasurement items: Objective indicators measured using electroencephalography, actigraphy, and internal core body temperature monitors.Subjective indicators evaluated using the OSA Sleep Questionnaire (MA version)*.Verification method: A crossover study will be conducted where all subjects will stay for three days under each of the three conditions: "natural hot spring in the hotel," "room bath with tap water," and "morning shower in the room," and their sleep will be compared. Subjects will measure their body temperature from 90 minutes before bedtime until after waking up, and their sleep will be measured from before bedtime until after waking up.*A sleep evaluation method that statistically scales the feeling of sleep on a given day. 【Super Hotel Co., Ltd.】Established: December 1989Location: 1-7-7 Nishihonmachi, Nishi-ku, Osaka-shi, OsakaRepresentative Director: Kensaku YamamotoOfficial Website: https://www.superhotel.co.jp/ 【Akita University】Location: 1-1-1 Hondo, Akita-shi, AkitaResearcher for this study: Sachiko UemuraAffiliation: Department of Physical Therapy, Graduate School of Health Sciences, Akita University Graduate School of MedicinePosition: Associate Professor
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