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KMID : 1101120160130010008
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Journal of Sleep Medicine
2016 Volume.13 No. 1 p.8 ~ p.14
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Light Exposure and Sleep-Wake Pattern in Rapidly Rotating Shift Nurses
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Choi Su-Jung
Joo Eun-Yeon
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Abstract
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Objectives: Shift workers are at risk for various sleep and health-related problems. To investigate light exposure and sleep-wake pattern according to shift schedules in shift workers.
Methods: We enrolled 12 fulltime, rapidly rotating three-shift female nurses (age 26.4±4.01 years). They completed sleep logs and actigraphy monitoring of sleep-wake parameters, light exposure, and activity levels for over 14 days (mean numbers of night shifts 2.5).
Results: Before beginning shift work, participants were healthy and had no history of hypnotics. One third of participants (33.3%) had clinically significant insomnia-related symptoms (insomnia severity index ≥15, mean 14.0). Reported health problems were irregular menstruation cycles (75%), nightmares (25%), and irritable bowel syndrome (16.7%). Mean sleep time was less than 6 h regardless of the shift periods and wakefulness after sleep onset was prolonged more than 30 min. Light exposure in night-shift periods was the lowest during working hours and the highest during non-working hours. Activity levels were not different during working hours throughout the schedules.
Conclusions: Fast-rotating shift nurses sleep less and unsatisfactorily. Health-related problems were frequent in shift nurses. Rapidly rotating shift schedules and related inappropriate light exposure may be detrimental to sleep and health in shift workers.
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KEYWORD
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Shift work, Light exposure, Sleep, Health, Actigraphy
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