Open AccessCross‐sectional Internet‐based survey of Japanese permanent daytime workers’ sleep and daily rest periods
Author(s) -
Ikeda Hiroki,
Kubo Tomohide,
Sasaki Takeshi,
Liu Xinxin,
Matsuo Tomoaki,
So Rina,
Matsumoto Shun,
Yamauchi Takashi,
Takahashi Masaya
Publication year - 2018
Publication title -
journal of occupational health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 59
ISSN - 1348-9585
DOI - 10.1539/joh.17-0165-oa
Subject(s) - sleep (system call) , pittsburgh sleep quality index , sleep quality , medicine , daytime , cross sectional study , demography , gerontology , insomnia , psychiatry , atmospheric sciences , sociology , computer science , operating system , geology , pathology
Objectives This study aimed to describe the sleep quantity, sleep quality, and daily rest periods (DRPs) of Japanese permanent daytime workers. Methods Information about the usual DRP, sleep quantity, and sleep quality (Japanese version of the Pittsburgh Sleep Quality Index: PSQI‐J) of 3,867 permanent daytime workers in Japan was gathered through an Internet‐based survey. This information was analyzed and divided into the following eight DRP groups: <10, 10, 11, 12, 13, 14, 15, and 16 h. Results The sleep durations for workers in the <10, 10, 11, 12, 13, 14, 15, and 16 h DRP groups were found to be 5.3, 5.9, 6.1, 6.3, 6.5, 6.7, 6.7, and 6.9 h, respectively. The trend analysis revealed a significant linear trend as the shorter the DRP, the shorter was the sleep duration. The PSQI‐J scores for the <10, 10, 11, 12, 13, 14, 15, and 16 h DRP groups were 7.1, 6.7, 6.7, 6.3, 6.0 (5.999), 5.6, 5.2, and 5.2, respectively. The trend analysis revealed a significant linear trend as the shorter the DRP, the lower was the sleep quality. Conclusions This study described sleep quantity, sleep quality, and DRP in Japanese daytime workers. It was found that a shorter DRP was associated with poorer sleep quantity as well as quality.