title: Effects of evening light on body temperature.
abstract: Six healthy male subjects aged 21-35 years participated in the present study. The subjects were exposed to dim light (150 lux) or bright light (3000 lux) at eye level, from 19.00 to 21.30 h for 5 days. Rectal temperature and wrist activity were monitored throughout the study period. Rectal temperature nadir was delayed significantly after the bright light exposure. Ease in sleep initiation and overall sleep quality, measured by questionnaire, were aggravated significantly by the evening bright light exposure. These results suggest that strong illumination at night may disturb nocturnal sleep.
authors.affiliation: Department of Rehabilitation, Tokyo Metropolitan Neurological Hospital, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kubota
authors.forename: M
authors.initials: M
authors.lastname: Uchiyama
authors.forename: G
authors.initials: G
authors.lastname: Hirokawa
authors.forename: S
authors.initials: S
authors.lastname: Ozaki
authors.forename: M
authors.initials: M
authors.lastname: Hayasi
authors.forename: M
authors.initials: M
authors.lastname: Okawa
mesh_terms: D000328:Adult; D001833:Body Temperature Regulation; D002940:Circadian Rhythm; D006801:Humans; D008029:Lighting; D008297:Male; D009043:Motor Activity; D010775:Photic Stimulation; D012890:Sleep; D014851:Wakefulness