Is the use of high correlated color temperature light at night related to delay of sleep timing in university students? A cross-country study in Japan and China.

ABSTRACT:

Background

Blue-enriched white light at night has the potential to delay the circadian rhythm in daily life. This study was conducted to determine whether the use of high correlated color temperature (CCT) light at home at night is associated with delay of sleep timing in university students.

Methods

The survey was conducted in 2014-2015 in 447 university students in Japan and 327 students in China. Habitual sleep timing and type of CCT light at home were investigated by using a self-administered questionnaire. The Japanese students were significantly later than the Chinese students in bedtime, wake time, and midpoint of sleep. They were asked whether the lighting in the room where they spend most of their time at night was closer to warm color (low CCT) or daylight color (h

SUBMITTER: Higuchi S 

PROVIDER: S-EPMC8188719 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature