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2 LITTERATURE REVIEW the suppression of Melatonin as a direct effect of ALAN. (Reiter et al., 2007) In addition, obesity is also one of the consequences of ALAN and research in rotating night-shift work entails a higher risk of cancer development. (Tahara and Shibata, 2013) Pros and cons of light in different spectrums has been assessed in rele- vant research. (Webb, 2006) For female workers, a potential risk of devel- oping breast cancer and colon cancer has been investigated and show a developed risk over time. (Pauley, 2004; Figueiro, Rea and Bullough, 2006; Cho et al., 2015) Shift-work has also been prone to advance the risk of developing a mood disorder, but workers that experience quick returns (less than eleven hours between shifts) had less work/rest adaptation and showed a more positive connecting. Quick returns showed no relation to anxiety and depression (Eldevik et al., 2013)Symptoms of depression in night shift workers may be connected to the direct well-being and a direct consequence of the shift work as a stress-factor in the everyday lives of this population The circadian cycle is divided in sleep/wake also referred to as the subjec- tive day and subjective night, meaning the phase in the CR considered time to sleep or to be awake, this should be coordinated with the illuminated part of the day, but ALAN can turn this around in night shift work over a longer period. (Jewett et al., 1997; Duffy, Zeitzer and Czeisler, 2007) Findings from Duffy et al, 2007 indicate that the response to phase-delay decreases with age. Sleep and wakefulness are found to be highly sensible to bright light exposure at night time. Czeisler et al, 1990, found that early morning light can produce an advance and evening light can produce a delay of the normal cir- cadian temperature cycle. (Figure 7) In Contrast, being exposed to bright light during the subjective day only adds a slight stimulus. This means that bright light may have a positive effect on the normalisation of body temperature and daytime sleep in night shift work. (Czeisler et al., 1990) (Figure 7) « Figure 7, body temp related to BL according to subjective day (Czeisler et al., 1990) » Figure 8, Melatonin concentra- tion and brightness exposure (Zeitzer et al., 2000) Master thesis · MSc Lighting Design · Pernille Bech-Larsen · Fall 2017 27PDF Image | Healing with light
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