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Evaluating the Impact of Sleep Disruptions in Women through Automated Analysis
Published in Erick C. Jones, Supply Chain Engineering and Logistics Handbook, 2020
Shalini Gupta, Felicia Jefferson, Erick C. Jones
In America, 20% of the people work in odd times typically, not between 9 a.m. and 5 p.m. In this kind of situation, sleep disruption causes health issues [30]. Because of irregular routine and daytime sleeping hours, women get difficulty in getting quality sleep. In fact, studies show that women working in the night shift are hypersensitive toward mental and physical health issues, and this leads to more illnesses and accidents [62]. However, women working on the night shifts find it uneasy to fulfill their responsibilities and get less time for family and social activities. All these aspects cause irregular menstrual cycles, infertility, breast cancer, pregnancy issues, critical risks associated with miscarriages, and premature births [78]. However, most of the women working in night shift/non-traditional shifts do not observe any kind of typical issues in their babies [111].
Α Fatigue, Performance, and Medical Error
Published in Marilyn Sue Bogner, Human Error in Medicine, 2018
Circadian rhythms are highly resistant to alteration. Many bodily rhythms are linked to light-dark cycles accompanying sunrise and sunset and to the time of day meals are eaten, or when sleep is initiated. Shiftworkers who change work schedules from a day to night shift must undergo sleep and circadian rhythm adjustments. Some individuals require up to 2 weeks on a new work schedule before appreciable adjustments in bodily rhythms are made to match the new cycle (Comperatore & Krueger, 1990; Rosa & Tepas, 1990; Scott, 1990). Shiftworkers who settle into permanent night work schedules as a way of life exhibit circadian rhythms whose expected peaks and valleys of body temperature, mood, and performance are slightly displaced or phase-shifted by a few hours from those of the daytime worker.
Circadian Rhythms
Published in John A. Caldwell, J. Lynn Caldwell, Fatigue in Aviation, 2016
John A. Caldwell, J. Lynn Caldwell
As mentioned earlier, the sleep deprivation from insufficient daytime sleep and the nighttime drowsiness produced by circadian factors combine to create significant problems for aircrew who are working nights. Accidents are more likely, errors in performance are more frequent, mood is poorer, and motivation is lower at night than during the day. Night work not only poses safety risks, but it seems to impair immune-system functioning as well, making those on the night shift more prone to illness than their daytime counterparts. Outside of work, the fatigue from the night shift leads to high levels of sleepiness during the drive home, and as a result, vehicular accident rates are particularly high for workers driving home after a night of work. All in all, shift work creates a variety of difficulties in terms of performance, safety, and general well-being.
A Review of Human Physiological Responses to Light: Implications for the Development of Integrative Lighting Solutions
Published in LEUKOS, 2022
Céline Vetter, P. Morgan Pattison, Kevin Houser, Michael Herf, Andrew J. K. Phillips, Kenneth P. Wright, Debra J. Skene, George C. Brainard, Diane B. Boivin, Gena Glickman
Often, the discussion of nighttime light exposure mixes night shift work and light conditions. Because night shift work usually requires individuals to be awake and active during the night, it is not only associated with light exposure during the night, but also with alterations in timing and quality of food intake, melatonin suppression, and disrupted sleep (Vetter and Scheer 2019). Light levels experienced by shift workers at night are also typically brighter than outdoor nighttime illumination, which is an important factor to consider when drawing conclusions from studies on exposure to outdoor light at night and also, in night shift workers. Daugaard et al. (2017) have indeed shown that night shift workers show transient and partly light-mediated reductions in melatonin levels on workdays; however, this observation does not hold true on days off, wherein melatonin levels are comparable to those observed in day workers. Recent work by Razavi et al. (2019) further demonstrated that inter-individual differences in chronotype influence the relationship between shift work and melatonin levels. Future studies that differentiate between light at night and shift work (and all associated risk factors) are needed to better grasp the public health relevance of these distinct light exposure patterns.
An investigation of the effects of different shift schedules on the fatigue and sleepiness of officers on oil tankers during cargo handling operations
Published in Ergonomics, 2021
Farhad Azimi Yancheshmeh, S. Hossein Mousavizadegan, Amin Amini, Andrew P. Smith, Reza Kazemi
Shift work at sea can affect the performance of OOWs in a variety of ways. Laboratory and field studies show that night shift work causes misalignment in circadian rhythm and sleep homeostasis and hindrance of performance even in OOWs who have done night shifts for a long time. Evidence also suggests that only in a small percentage (less than %3) of people, who continuously work night shifts, is there ‘complete’ adjustment of their endogenous rhythms to the night-work (Rouch et al. 2005; Folkard 2008; Folkard and Åkerstedt 2004). In addition to the usual problems caused by shift work, OOWs have to cope with other challenges that arise from the nature of seafaring. Many sectors of shipping involve a 24/7 industry, and seafarers live in an isolated and confined environment (ICE) for a long time. They sleep while exposed to the effect of stressors, such as noise, vibrations, and ship movements (Phillips 2000; Smith, Allen, and Wadsworth 2006; Hystad and Eid 2016). These factors hinder restorative sleep, impair the sleep quality chronically (Hystad and Eid 2016; Smith 2007; Carotenuto et al. 2012), and cause fatigue and sleepiness in OOWs (Phillips 2000; Smith, Allen, and Wadsworth 2006; Strauch 2015; Lützhöft et al. 2010).
Interplay between rotational work shift and high altitude-related chronic intermittent hypobaric hypoxia on cardiovascular health and sleep quality in Chilean miners
Published in Ergonomics, 2020
Camila Pizarro-Montaner, Jorge Cancino-Lopez, Alvaro Reyes-Ponce, Marcelo Flores-Opazo
We found that both groups showed a prolong sleep latency and sleep disturbances, although there were no significant differences in sleep hours between groups (data not shown). It is plausible that RWS and CIHH combined effect may have increased these alterations due to the decreased environmental partial pressure of oxygen at high altitude (Farias et al. 2013). Furthermore, higher sleep disturbances observed in the RWS-CIHH group could be related to nocturnal awakenings commonly found in mining workers exposed to altitude. Night shift work impairs both external environmental (i.e. natural light/dark cycle) and internal homeostatic cues (i.e. melatonin cycling, central nervous system arousal and internal clock) that regulate the rhythm of sleep and wakefulness, and then these signals desynchronise affecting negatively both active and resting periods (Akerstedt 2003). Thus, for night shift workers daytime sleep becomes short and fragmented, leading to homeostatic sleep debt and blunted circadian arousal at night-time, which translates into excessive sleepiness at work, and insomnia (Akerstedt 2003; Ohayon and Reynolds 2009). Worsening of sleep quality has been reported even in retirees of this work system, with a higher prevalence of insomnia (Monk et al. 2013). On the other hand, the exposure to CIHH due to high altitude at workplace has been associated with breathing disturbances and increased prevalence of apnoeas (Stadelmann et al. 2013). CIHH also impairs sleep quality at the deepest stages of sleep, inducing brief awakenings throughout the night and consequently creating a less efficient and repairing sleep (Srivastava 2015).