Effect of color temperature of light sources on slow-wave sleep

Tomoaki Kozaki, Shingo Kitamura, Yuichi Higashihara, Keita Ishibashi, Hiroki Noguchi, Akira Yasukouchi

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

In order to examine whether the spectral compositions of light source may affect sleep quality, sleep architecture under different color temperatures of light sources was evaluated. Seven healthy males were exposed to the light sources of different color temperatures (3000K, 5000K and 6700 K) for 6.5 h before sleep. The horizontal illuminance level was kept at 1000 lux. Subjects slept on a bed in near darkness (< 10 lux) after extinguishing the light, and polysomnograms recorded the sleep parameters. In the early phase of the sleep period, the amount of stage-4 sleep (S4-sleep) was significantly attenuated under the higher color temperature of 6700 K compared with the lower color temperature of 3000 K. Present findings suggest that light sources with higher color temperatures may affect sleep quality in a view that S4-sleep period is important for sleep quality.

Original languageEnglish
Pages (from-to)183-186
Number of pages4
JournalJournal of physiological anthropology and applied human science
Volume24
Issue number2
DOIs
Publication statusPublished - Mar 1 2005

All Science Journal Classification (ASJC) codes

  • Social Sciences(all)

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