Wake Up Time, Light, and Mood in a Population Sample Age 40-64 Years
Psychiatry Investigation
;
: 177-182, 2015.
Artigo
em Inglês
| WPRIM
| ID: wpr-17592
ABSTRACT
OBJECTIVE:
Concern that disturbances of sleep and light exposures at night might increase cancer risks have been expressed, but little actual exposure data has been collected. Measurements from a representative population sample were examined to understand the magnitude of in-bed light exposure at night and possible correlates.METHODS:
From 1990 to 1994, a home survey of sleep disorders among adults ages 40-64 was conducted in the City of San Diego California, using stratified representative sampling techniques. Along with questionnaires, sleep logs, and 3-night wrist activity and pulse oximetry measures, bedside illumination was measured with a computer recording system. Questionnaires included the CESD depression scale and a scale of symptoms typical of winter depression.RESULTS:
Complete data were available from 286 men and women, whose mean in-bed intervals averaged 7 hours and 42 minutes. The mean room illumination during the first part of the night was mean 12.7 lux (median 3.2 lux) and during the last 2 hours in bed averaged 28.7 lux (median 18.9 lux). Nocturnal light exposure was positively correlated with age, male gender, summer season, time in bed, wake-up time, and depressive symptoms.CONCLUSION:
Complex bi-directional interactions may take place between sleep disturbances, depression, time in bed, wake-up-time, and in-bed illumination. The most crucial light exposures appear to occur in the last 2 hours in bed, largely after dawn, so daylight exposure may be an important factor.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Fotometria
/
Estações do Ano
/
Transtornos do Sono-Vigília
/
Punho
/
Iluminação
/
Oximetria
/
California
/
Inquéritos e Questionários
/
Ritmo Circadiano
/
Depressão
Limite:
Adulto
/
Feminino
/
Humanos
/
Masculino
País/Região como assunto:
América do Norte
Idioma:
Inglês
Revista:
Psychiatry Investigation
Ano de publicação:
2015
Tipo de documento:
Artigo
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