Early evening light mitigates sleep compromising physiological and alerting responses to subsequent late evening light.

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, 400

SUBMITTER: Te Kulve M 

PROVIDER: S-EPMC6831674 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature