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Author |
Te Kulve, M.; Schlangen, L.J.M.; van Marken Lichtenbelt, W.D. |
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Title |
Early evening light mitigates sleep compromising physiological and alerting responses to subsequent late evening light |
Type |
Journal Article |
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Year |
2019 |
Publication |
Scientific Reports |
Abbreviated Journal |
Sci Rep |
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Volume |
9 |
Issue |
1 |
Pages |
16064 |
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Keywords |
Human Health |
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Abstract |
The widespread use of electric light and electronic devices has resulted in an excessive exposure to light during the late-evening and at night. This late light exposure acutely suppresses melatonin and sleepiness and delays the circadian clock. Here we investigate whether the acute effects of late-evening light exposure on our physiology and sleepiness are reduced when this light exposure is preceded by early evening bright light. Twelve healthy young females were included in a randomised crossover study. All participants underwent three evening (18:30-00:30) sessions during which melatonin, subjective sleepiness, body temperature and skin blood flow were measured under different light conditions: (A) dim light, (B) dim light with a late-evening (22:30-23:30) light exposure of 750 lx, 4000 K, and (C) the same late-evening light exposure, but now preceded by early-evening bright light exposure (18.30-21.00; 1200 lx, 4000 K). Late-evening light exposure reduced melatonin levels and subjective sleepiness and resulted in larger skin temperature gradients as compared to dim. Interestingly, these effects were reduced when the late-evening light was preceded by an early evening 2.5-hour bright light exposure. Thus daytime and early-evening exposure to bright light can mitigate some of the sleep-disruptive consequences of light exposure in the later evening. |
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Address |
Department of Human Biology & Movement Sciences, NUTRIM, Maastricht University, Maastricht, The Netherlands |
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Language |
English |
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ISSN  |
2045-2322 |
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Notes |
PMID:31690740; PMCID:PMC6831674 |
Approved |
no |
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Call Number |
GFZ @ kyba @ |
Serial |
2751 |
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