Citation

Figueiro M, Rea M. Light. Res. Tech. 2011; 43(3): 349-369.

Copyright

(Copyright © 2011, SAGE Publishing)

DOI

10.1177/1477153511404175

PMID

unavailable

Abstract

A within-subjects study investigated the impact of sleep opportunities and periodic light exposures on biomarkers, performance and sleepiness over 27-hour sessions. Ten subjects experienced three experimental sleep sessions: No sleep; sleep for 3 hours; and sleep for 7 hours. Subjects remained in dim red light for every experimental session, except when they were exposed to 40 lux of 470-nm light at the cornea for 50 minutes. Saliva samples for biomarker assays, performance scores on psychomotor vigilance tests and self-reports of sleepiness were collected just prior to and at the end of the light exposures. All measures follow circadian patterns that mark the transitions between daytime and nighttime, but they have different forms and are differentially affected by light exposure, sleep and circadian time.