Citation

Figueiro M, Brons J, Plitnick B, Donlan B, Leslie R, Rea M. Light. Res. Tech. 2011; 43(2): 201-215.

Copyright

(Copyright © 2011, SAGE Publishing)

DOI

10.1177/1477153510382853

PMID

unavailable

Abstract

A field study was conducted with eighth-grade students to determine the impact of morning light on circadian timing, sleep duration and performance. Before and during school hours for a week in February 2009, half the students studied wore orange glasses that minimised the short-wavelength light exposure needed for circadian system stimulation. A control group did not wear the orange glasses. The Daysimeter, a circadian light meter, measured light/dark exposures in both groups for 7 days. Circadian timing was significantly delayed for those students who wore orange glasses compared to the control group. Sleep durations were slightly, but not significantly, curtailed in the orange-glasses group. Performance scores on a brief, standardised psychomotor vigilance test and self-reports of well-being were not significantly different between the two groups.