Dark Goggles and Bright Light Improve Circadian Rhythm Adaptation to Night-Shift Work

Eastman, Charmane I.; Stewart, Karen T.; Mahoney, Michael; Liu, Liwen; Fogg, Louis

doi:10.1093/sleep/17.6.535

Cited by 161 publications

(97 citation statements)

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“…50 The greatest circadian adjustments occur in groups using both bright light during the night shift and light avoidance the following morning. 51 Dark sunglasses and a dark home environment can decrease bright light exposure during the day. Though little evidence exists to support widespread application of bright light devices in hospitalists' call-rooms, a hospitalist practice should consider installing one to promote circadian adaptation if physicians working overnight have multiple consecutive shifts.…”

Section: Improved Sleep Before Workmentioning

confidence: 99%

Sleep and circadian misalignment for the hospitalist: A review

Schaefer

Williams

Zee

2012

Journal of Hospital Medicine

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Shift work is necessary for hospitalists to provide on‐site 24‐hour patient care. Like all shift workers, hospitalists working beyond daylight hours are subject to a misalignment between work obligations and the endogenous circadian system, which regulates sleep and alertness patterns. With chronic misalignment, sleep loss accumulates and can lead to shift work disorder or other chronic medical conditions. Hospitalists suffering from sleep deprivation also risk increased rates of medical errors. By realigning work and circadian schedules, a process called circadian adaptation, hospitalists can limit fatigue and potentially improve safety. Adaptation strategies include improving sleep hygiene before work, caffeine use at the start of the night shift, bright light exposure and planned naps during the shift, and short‐term use of a mild hypnotic after night work. If these attempts fail and chronic fatigue persists, then a diagnosis of shift work disorder should be considered, which can be treated with stronger pharmacotherapy. Night float scheduling strategies may also help to limit chronic sleep loss. More research is urgently needed regarding the sleep patterns and job performance of hospitalists working at night to improve scheduling decisions and patient safety. Journal of Hospital Medicine 2012; © 2012 Society of Hospital Medicine

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Section: Improved Sleep Before Workmentioning

confidence: 99%

Sleep and circadian misalignment for the hospitalist: A review

Schaefer

Williams

Zee

2012

Journal of Hospital Medicine

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“…Bright light has been proposed as a countermeasure to physiological maladaptation to shifted sleep/wake schedules based on a number of previous laboratory investigations 84,120,[135][136][137][138][139][140][141][142][143][144] (Fig. 1).…”

Section: Bright Light Technology In Managing Shift Work Problemsmentioning

confidence: 99%

“…A specific resetting effect of sleep/darkness pulse, independent of the timing of room light, cannot be totally excluded since this can influence light-induce phase shifts 149) . The shielding from morning sunlight, by wearing dark goggles, can also elicit adaptive phase delays independently of bright light exposure at night 141) . Nevertheless, the combination of bright light at night and morning goggles during the day induces the greatest phase delays 141,146) and can significantly improve daytime sleep quality 150) .…”

Section: Bright Light Technology In Managing Shift Work Problemsmentioning

confidence: 99%

Light Treatment and Circadian Adaptation to Shift Work

Boivin

James

2005

Ind Health

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Work at unconventional hours can have both long and short term consequences. Shift workers are often required to perform their duties at times that are not favoured by the body's endogenous clock, or circadian pacemaker. A typical night shift worker, for example, may report reductions in alertness and performance during shifts, or significant difficulty attaining sleep of recuperative value in the day, all the while being more likely to develop health complications. The study of circadian physiology has significantly contributed to our current ability to aid the shift worker deal with atypical schedules. We discuss the usefulness of light treatment as a countermeasure for maladaptation to atypical work schedules.

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“…Participants in the current study were exposed to sunlight each morning prior to going to bed, but the duration and/or intensity of exposure (i.e. 20 min of sunlight starting 16 min after sunrise) may not have provided a sufficiently strong advance signal to inhibit adaptation 15) . In summary, the data indicate that people may be able to adapt to a pattern of work that includes several consecutive night shifts if they adhere to a fixed sleep schedule, if their exposure to morning sunlight is minimized, and if they are provided with an ideal sleep environment (i.e.…”

Section: Amt6s Concentration During a Week Of Night Workmentioning

confidence: 99%

Changes in the Concentration of Urinary 6-sulphatoxymelatonin during a Week of Simulated Night Work

et al. 2005

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The aim of the study was to examine the adaptation of participants to a common night work schedule using urinary 6-sulphatoxymelatonin (aMT6s) concentration as the circadian phase marker. Fifteen adults (7 male, 8 female, age = 21.9 yr) spent nine consecutive nights in the laboratory, including: (i) adaptation sleep, (ii) baseline sleep, and (iii) seven simulated night shifts (23:00-07:00 h) followed by daytime sleep. During the baseline and daytime sleeps, participants collected urine samples which were subsequently assayed for aMT6s. The concentration of aMT6s in urine for the first three day sleeps was significantly lower than for the baseline sleep, but there was no difference in aMT6s concentrations between any of the last three day sleeps and the baseline sleep. The data indicate that people may adapt to a pattern of work that includes seven consecutive night shifts if they adhere to a fixed sleep schedule, if their exposure to morning sunlight is minimised, and if they are provided with an ideal sleep environment.

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Dark Goggles and Bright Light Improve Circadian Rhythm Adaptation to Night-Shift Work

Cited by 161 publications

References 0 publications

Sleep and circadian misalignment for the hospitalist: A review

Sleep and circadian misalignment for the hospitalist: A review

Light Treatment and Circadian Adaptation to Shift Work

Changes in the Concentration of Urinary 6-sulphatoxymelatonin during a Week of Simulated Night Work

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