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Effects of 2-hour nighttime nap on melatonin concentration and alertness during 12-hour simulated night work

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Title: Effects of 2-hour nighttime nap on melatonin concentration and alertness during 12-hour simulated night work
Authors: Lee, Sang-Il Browse this author
Nishi, Takeshi Browse this author
Takahashi, Masaya Browse this author
Higuchi, Shigekazu Browse this author
Keywords: Night work
Nighttime nap
Melatonin suppression
Subjective sleepiness
Vigilance performance
Issue Date: 27-Sep-2021
Publisher: 独立行政法人 労働安全衛生総合研究所(National Institute of Occupational Safety and Health, Japan)
Journal Title: Industrial Health
Volume: 59
Issue: 6
Start Page: 393
End Page: 402
Publisher DOI: 10.2486/indhealth.2020-0245
Abstract: A nighttime nap is expected to mitigate melatonin suppression during night work by blocking light input to the retina, but it is unclear. In the present study, we investigated the effects of a nap break on melatonin level, subjective sleepiness, and vigilance performance during simulated night work. Eleven healthy young males (mean +/- SD age: 22.2 +/- 4.1 years) participated in counterbalanced crossover design experiments with two conditions (nap vs. no nap). The subjects performed I 2-hour simulated night work from 21:00 to 09:00 h (illuminance: similar to 500 lx). Subjects with a nap condition took a nap for 2 hours in a dark room from 03:00, si bile subjects with a no nap condition continued the simulated night work. The results showed that immediately after the 2-h nap break, the melatonin level at 05:00 h temporarily recovered from light-induced melatonin suppression during the simulated night work but significantly suppressed again at 07:00 and 09:00 h. Subjective alertness and vigilance performance were impaired immediately after the nap break but subsequently enhanced. The results suggest that a single nap break for 2 hours could be a strategy to enhance alertness (luring the last part of night shift but inadequate for mitigating melatonin suppression.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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