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The LF\/HF decreased under optimal conditions by 19% compared to the control conditions. Next, the effects of optimal conditions before sleep on the sleep quality were evaluated. Based on the index for the sleep quality (light sleep index), effect of the optimal environment conditions before sleep was not clearly observed for all subjects. Clustering analysis was evaluated to analyze the cause deeply. As a result, for the group of experiment subjects who did not feel nervous about the experiment, the light sleep index was decreased under optimal conditions by 29% compared to the control conditions. It was found that the effect on such stimuli could disappear in the subjects who were nervous about the experiment.<\/jats:p>","DOI":"10.3233\/ais-210489","type":"journal-article","created":{"date-parts":[[2023,1,24]],"date-time":"2023-01-24T12:45:02Z","timestamp":1674564302000},"page":"165-178","source":"Crossref","is-referenced-by-count":0,"title":["Effects of environmental control before sleeping on autonomic nervous activity and sleep: A pilot study"],"prefix":"10.1177","volume":"15","author":[{"given":"Yuko","family":"Matsuhisa","sequence":"first","affiliation":[{"name":"Electric Works Company, Lifestyle Updates Business Division, Panasonic Corporation, Osaka, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazuhiro","family":"Ide","sequence":"additional","affiliation":[{"name":"Living Appliances and Solutions Company, Lifestyle Updates Business Division, Panasonic Corporation, Osaka, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toru","family":"Nakamura","sequence":"additional","affiliation":[{"name":"Electric Works Company, Lifestyle Updates Business Division, Panasonic Corporation, Osaka, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuki","family":"Kunugida","sequence":"additional","affiliation":[{"name":"Data Analysis Solution Division, Panasonic Information Systems Co., Ltd., Osaka, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takuya","family":"Yamamura","sequence":"additional","affiliation":[{"name":"Data Analysis Solution Division, Panasonic Information Systems Co., Ltd., Osaka, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Makoto","family":"Komazawa","sequence":"additional","affiliation":[{"name":"WIN Frontier Co., Ltd., Tokyo, Japan"},{"name":"Functional Control System Course, Shibaura Institute of Technology, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Koichi","family":"Masuda","sequence":"additional","affiliation":[{"name":"Electric Works Company, Lifestyle Updates Business Division, Panasonic Corporation, Osaka, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yosky","family":"Kataoka","sequence":"additional","affiliation":[{"name":"Cellular Function Imaging Team, RIKEN Center for Life Science Technologies, Kobe, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","reference":[{"key":"10.3233\/AIS-210489_ref1","doi-asserted-by":"publisher","first-page":"263","DOI":"10.1111\/j.1469-8986.1966.tb02650.x","article-title":"The first night effect: An EEC study of sleep","volume":"2","author":"Agnew","year":"1966","journal-title":"Psychophysiology"},{"key":"10.3233\/AIS-210489_ref3","doi-asserted-by":"publisher","first-page":"369","DOI":"10.33549\/physiolres.930645","article-title":"Spectral analysis of heart rate variability in sleep","volume":"54","author":"Busek","year":"2005","journal-title":"Physiol. 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