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Effects of evening light on body temperature
Author(s) -
KUBOTA TOMIO,
UCHIYAMA MAKOTO,
HIROKAWA GO,
OZAKI SIGERU,
HAYASI MITUKO,
OKAWA MASAKO
Publication year - 1998
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1111/j.1440-1819.1998.tb01057.x
Subject(s) - evening , rectal temperature , nocturnal , sleep quality , sleep (system call) , medicine , audiology , nadir , ophthalmology , anesthesia , physics , insomnia , psychiatry , satellite , astronomy , computer science , operating system
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.