Effects of artificial light at night on human health: A literature review of observational and experimental studies applied to exposure assessment

YongMin Cho, Seung Hun Ryu, Byeo Ri Lee, Kyung Hee Kim, Eun Il Lee, Jae Wook Choi

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

It has frequently been reported that exposure to artificial light at night (ALAN) may cause negative health effects, such as breast cancer, circadian phase disruption and sleep disorders. Here, we reviewed the literature assessing the effects of human exposure to ALAN in order to list the health effects of various aspects of ALAN. Several electronic databases were searched for articles, published through August 2014, related to assessing the effects of exposure to ALAN on human health; these also included the details of experiments on such exposure. A total of 85 articles were included in the review. Several observational studies showed that outdoor ALAN levels are a risk factor for breast cancer and reported that indoor light intensity and individual lighting habits were relevant to this risk. Exposure to artificial bright light during the nighttime suppresses melatonin secretion, increases sleep onset latency (SOL) and increases alertness. Circadian misalignment caused by chronic ALAN exposure may have negative effects on the psychological, cardiovascular and/or metabolic functions. ALAN also causes circadian phase disruption, which increases with longer duration of exposure and with exposure later in the evening. It has also been reported that shorter wavelengths of light preferentially disturb melatonin secretion and cause circadian phase shifts, even if the light is not bright. This literature review may be helpful to understand the health effects of ALAN exposure and suggests that it is necessary to consider various characteristics of artificial light, beyond mere intensity.

Original languageEnglish
Pages (from-to)1294-1310
Number of pages17
JournalChronobiology International
Volume32
Issue number9
DOIs
Publication statusPublished - 2015 Oct 21

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Observational Studies
Light
Health
Melatonin
Breast Neoplasms
Lighting
Habits
Sleep
Databases
Psychology

Keywords

  • Artificial light at night
  • breast cancer
  • circadian rhythm
  • light exposure
  • light pollution

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Effects of artificial light at night on human health : A literature review of observational and experimental studies applied to exposure assessment. / Cho, YongMin; Ryu, Seung Hun; Lee, Byeo Ri; Kim, Kyung Hee; Lee, Eun Il; Choi, Jae Wook.

In: Chronobiology International, Vol. 32, No. 9, 21.10.2015, p. 1294-1310.

Research output: Contribution to journalArticle

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