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Effects of Laughter on Sleep Ayako Nitta 1 , Masako Shibuya 2 , Shojiro Inoue 3 1School of Allied Health Sciences, Division of Nursing Sciences, Faculty of Medicine, Tokyo Medical and Dental University 2School of Allied Health Sciences, Division of Nursing Sciences, Faculty of Medicine, Tokyo Medical and Dental University 3Institute for Medical and Dental Engineering Tokyo Medical and Dental University Keyword: 笑い , 睡眠 , 看護 , 直腸温 pp.259-267
Published Date 1998/6/15
DOI https://doi.org/10.11477/mf.1681900457
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 Six young female subjects watched a 90-min movie program on TV screen starting 3.5 hours before retiring at 23:00. Comical video programs caused significantly long duration of pleasant laughter (1930 sec) as against educational ones (56 sec). The laughter induced dynamic fluctuations of rectal temperature and blood pressure during and after video watching. Rectal temperature at post-laughter nights remained higher than that at control nights. Polygraphic records revealed that the laughter experience significantly delayed sleep onset and reduced the amounts of total sleep, slow wave sleep and rapid-eye-movement sleep. However, the subjects reported better subjective feeling at awaking and less sleepiness during daytime. In conclusion, the laughter-induced emotional excitement in the evening seems to deteriorate the quantity and quality of sleep but improve the subjective psychological state on the next day.


Copyright © 1998, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1405 印刷版ISSN 0022-8370 医学書院

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