Sleep Clinical Trial
Official title:
A Study of Two Different Light Conditions for Healthy Subjects Above 65 Years
to investigate the effect of two lightning conditions on sleep hypothesizing that sleep length is influenced by the color of light during daytime
Lightning conditions seems to be important for the length and quality of sleep, as light have
an influence on the production of the sleep hormone (melatonin) and the the circadian rhythm.
Entrainment of the circadian rhythm to the surroundings is accomplished by light-sensitive
retinal ganglion cells and these cells are sensitive to blue light.
Based on previous research, blue light early in the day and abscence of blue light during
evening is important for the entrainment.
In this study, lightning conditions in the home of healthy subjects are set to either blue
enriched or red enriched from 8 a.m to 1. p.m. The lightning condition is based on a
randomization protocol in a cross-over study for 3 weeks in each condition, separated by a
one week pause.
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