Exposure to indoor light at night in relation to multiple dimensions of sleep health: findings from the Sister Study

Author:

Sweeney Marina R12,Nichols Hazel B1,Jones Rena R3,Olshan Andrew F1ORCID,Keil Alexander P1,Engel Lawrence S1,James Peter45,Sandler Dale P2,White Alexandra J2,Jackson Chandra L26ORCID

Affiliation:

1. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina , Chapel Hill, NC , USA

2. Epidemiology Branch, National Institute of Environmental Health Sciences , Research Triangle Park, NC , USA

3. Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute , Rockville, MD , USA

4. Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute , Boston, MA , USA

5. Department of Environmental Health, Harvard TH Chan School of Public Health , Boston, MA , USA

6. Division of Intramural Research, National Institute on Minority Health and Health Disparities, National Institutes of Health, Department of Health and Human Services , Bethesda, MD , USA

Abstract

Abstract Study Objective To examine the association between light at night (LAN) and multiple sleep health dimensions Methods Among 47 765 Sister Study participants, indoor LAN (TV on in the room, light(s) on in room, light from outside the room, nightlight, no light) and sleep dimensions were self-reported at baseline (2003–2009). We used Poisson regression with robust variance to estimate adjusted prevalence ratios (PR) and 95% confidence intervals (CI) for the cross-sectional associations between LAN and short sleep duration (<7 hours/night), insomnia symptoms (difficulty falling or staying asleep), frequent napping (≥3 naps/week), inconsistent sleep/wake time (differed day-to-day and week-to-week), sleep debt (≥2 hours between longest and shortest duration), recent sleep medication use, and a cumulative poor sleep score (≥3 poor sleep dimensions). Population-attributable risks (PARs) were determined for any light exposure vs. none by race/ethnicity. Results Compared to sleeping with no light in the bedroom, sleeping with a TV on was associated with a higher prevalence of most dimensions of poor sleep (e.g. short sleep duration: PR = 1.38, 95% CI: 1.32 to 1.45; inconsistent sleep/wake time: PR = 1.55, 95% CI: 1.44 to 1.66; sleep debt: PR = 1.36, 95% CI: 1.29 to 1.44; poor sleep score: PR = 1.58, 95% CI: 1.48-1.68). PARs tended to be higher for non-Hispanic black women compared to non-Hispanic white women. Conclusions Sleeping with a TV on was associated with poor sleep health among US women, and non-Hispanic black women may be disproportionately burdened.

Funder

National Institute of Environmental Health Sciences

Intramural Research Program

National Institute on Minority Health and Health Disparities

Publisher

Oxford University Press (OUP)

Subject

Physiology (medical),Neurology (clinical)

Reference61 articles.

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