Journal
CHRONOBIOLOGY INTERNATIONAL
Volume 29, Issue 5, Pages 619-628Publisher
INFORMA HEALTHCARE
DOI: 10.3109/07420528.2012.675257
Keywords
Bright light; Melatonin; Night-Shift; Phase shift adjustment; Shiftwork; Sleep
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Funding
- Canadian Institutes of Health Research Funding Source: Medline
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The objective of this study was to quantify daytime sleep in night-shift workers with and without an intervention designed to recover the normal relationship between the endogenous circadian pacemaker and the sleep/wake cycle. Workers of the treatment group received intermittent exposure to full-spectrum bright light during night shifts and wore dark goggles during the morning commute home. All workers maintained stable 8-h daytime sleep/darkness schedules. The authors found that workers of the treatment group had daytime sleep episodes that lasted 7.1 +/- .1 h (mean +/- SEM) versus 6.6 +/- .2 h for workers in the control group (p = .04). The increase in total sleep time co-occurred with a larger proportion of the melatonin secretory episode during daytime sleep in workers of the treatment group. The results of this study showed reestablishment of a phase angle that is comparable to that observed on a day-oriented schedule favors longer daytime sleep episodes in night-shift workers. (Author correspondence: diane.boivin@douglas.mcgill.ca)
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