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Wake up time, light, and mood in a population sample age 40-64 years.

Endo T, Kripke DF, Ancoli-Israel S - Psychiatry Investig (2014)

Bottom Line: 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.Questionnaires included the CESD depression scale and a scale of symptoms typical of winter depression.Complete data were available from 286 men and women, whose mean in-bed intervals averaged 7 hours and 42 minutes.

View Article: PubMed Central - PubMed

Affiliation: Sleep Clinic Chofu, Tokyo, Japan.

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.

No MeSH data available.


Related in: MedlinePlus

Mean (X) and standard error of the mean time getting out of bed by age group. The 60-64 years age group arose significantly later than each younger age group.
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Figure 1: Mean (X) and standard error of the mean time getting out of bed by age group. The 60-64 years age group arose significantly later than each younger age group.

Mentions: In this sample, the mean time going to bed was 22:54 (median 22:50, SD 65 min, range 19:58-2:50), the mean time getting out of bed was 6:36 (median 6:33, SD 72 min, range 3:41-11:05), and the mean in-bed interval was 7 hr 42 min (median 7 hr 44 min, SD 64 min, range 4 hr 46 min-12 hr 47 min). The time getting out of bed was positively correlated with the time going to bed (product-moment correlation; r=0.552, p<0.0001), and with age (r=0.121, p<0.05) but not with gender (ANCOVA controlled for age: F=0.12, DF=1, p=0.91), environmental day length (partial correlation controlled for age: rp=0.03, p=0.64) nor ethnicity (ANCOVA controlled for age: F=0.77, DF=4, p=0.57). Figure 1 illustrates the times getting out of bed, summarized by 5-year age intervals. The time getting out of bed was affected by age group (ANOVA: F=3.35, DF=4, p<0.05). The time getting out of bed in the oldest group (60-64 years) was significantly phase-delayed compared to the other age groups.


Wake up time, light, and mood in a population sample age 40-64 years.

Endo T, Kripke DF, Ancoli-Israel S - Psychiatry Investig (2014)

Mean (X) and standard error of the mean time getting out of bed by age group. The 60-64 years age group arose significantly later than each younger age group.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4390587&req=5

Figure 1: Mean (X) and standard error of the mean time getting out of bed by age group. The 60-64 years age group arose significantly later than each younger age group.
Mentions: In this sample, the mean time going to bed was 22:54 (median 22:50, SD 65 min, range 19:58-2:50), the mean time getting out of bed was 6:36 (median 6:33, SD 72 min, range 3:41-11:05), and the mean in-bed interval was 7 hr 42 min (median 7 hr 44 min, SD 64 min, range 4 hr 46 min-12 hr 47 min). The time getting out of bed was positively correlated with the time going to bed (product-moment correlation; r=0.552, p<0.0001), and with age (r=0.121, p<0.05) but not with gender (ANCOVA controlled for age: F=0.12, DF=1, p=0.91), environmental day length (partial correlation controlled for age: rp=0.03, p=0.64) nor ethnicity (ANCOVA controlled for age: F=0.77, DF=4, p=0.57). Figure 1 illustrates the times getting out of bed, summarized by 5-year age intervals. The time getting out of bed was affected by age group (ANOVA: F=3.35, DF=4, p<0.05). The time getting out of bed in the oldest group (60-64 years) was significantly phase-delayed compared to the other age groups.

Bottom Line: 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.Questionnaires included the CESD depression scale and a scale of symptoms typical of winter depression.Complete data were available from 286 men and women, whose mean in-bed intervals averaged 7 hours and 42 minutes.

View Article: PubMed Central - PubMed

Affiliation: Sleep Clinic Chofu, Tokyo, Japan.

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.

No MeSH data available.


Related in: MedlinePlus