Month-to-month variation in sleep among healthy, Scandinavian daytime workers
Garde, Anne Helene ; Hansen, Åse Marie ; Persson, Roger LU
; Österberg, Kai
LU
; Ørbæk, Palle
; Karlson, Björn
LU
; Olsen, Annemarie
and Kristiansen, Jesper
(2014)
In Scandinavian Journal of Clinical & Laboratory Investigation
74(6).
p.527-535
- Abstract
- Background. The overall purpose of the present study was to attain more insight in month-to-month variation of sleep duration and quality in order to improve design and interpretation of, e.g. epidemiological studies using sleep as outcome. Methods. The study design entailed monthly self-reports from 38 (26 women/12 men) daytime workers, who completed the Karolinska Sleep Diary (KSD) once a month during one year. A subgroup (n = 16) also wore actigraphs on one day every month during a year. Self-reports of bedtime, time of awakening, sleep duration, individual sleep characteristics, disturbed sleep index (DSI, 4 items) and awakening index (AWI, 3 items) were analyzed together with actigraphy-derived measures. Hours of daylight were used to... (More)
- Background. The overall purpose of the present study was to attain more insight in month-to-month variation of sleep duration and quality in order to improve design and interpretation of, e.g. epidemiological studies using sleep as outcome. Methods. The study design entailed monthly self-reports from 38 (26 women/12 men) daytime workers, who completed the Karolinska Sleep Diary (KSD) once a month during one year. A subgroup (n = 16) also wore actigraphs on one day every month during a year. Self-reports of bedtime, time of awakening, sleep duration, individual sleep characteristics, disturbed sleep index (DSI, 4 items) and awakening index (AWI, 3 items) were analyzed together with actigraphy-derived measures. Hours of daylight were used to test for circa-annual variation in statistical models adjusted for intake of hypnotics and alcohol, gender, age and within-person variability. Results. Hours of daylight were found to be associated to self-reported bedtime (p = 0.032) and DSI (p = 0.030), thereby indicating a circa-annual variation. Bedtime was delayed by 1.8 min (95% CI: 0.6-2.9 min) per 1 hour increase in length of daylight. Sleep was slightly more disturbed during the winter. Conclusion. Only circa-annual variation in self-reports of bedtime and DSI were observed in a healthy daytime working population, and the effects were small. Therefore potential bias due to circa-annuality in the studied parameters appears to be of limited concern in adult daytime working populations. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4451608
- author
- Garde, Anne Helene
; Hansen, Åse Marie
; Persson, Roger
LU
; Österberg, Kai
LU
; Ørbæk, Palle
; Karlson, Björn
LU
; Olsen, Annemarie
and Kristiansen, Jesper
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Sleep quality, circa-annual variation, human, sleep duration
- in
- Scandinavian Journal of Clinical & Laboratory Investigation
- volume
- 74
- issue
- 6
- pages
- 527 - 535
- publisher
- Informa Healthcare
- external identifiers
-
- wos:000342056100010
- scopus:84907044889
- pmid:24824844
- ISSN
- 1502-7686
- DOI
- 10.3109/00365513.2014.913303
- language
- English
- LU publication?
- yes
- id
- 8ee0f677-dce3-4cf9-ace9-8bbac63d0e74 (old id 4451608)
- alternative location
- http://informahealthcare.com/doi/pdfplus/10.3109/00365513.2014.913303
- date added to LUP
- 2016-04-01 10:46:54
- date last changed
- 2022-03-27 19:30:42
@article{8ee0f677-dce3-4cf9-ace9-8bbac63d0e74,
abstract = {{Background. The overall purpose of the present study was to attain more insight in month-to-month variation of sleep duration and quality in order to improve design and interpretation of, e.g. epidemiological studies using sleep as outcome. Methods. The study design entailed monthly self-reports from 38 (26 women/12 men) daytime workers, who completed the Karolinska Sleep Diary (KSD) once a month during one year. A subgroup (n = 16) also wore actigraphs on one day every month during a year. Self-reports of bedtime, time of awakening, sleep duration, individual sleep characteristics, disturbed sleep index (DSI, 4 items) and awakening index (AWI, 3 items) were analyzed together with actigraphy-derived measures. Hours of daylight were used to test for circa-annual variation in statistical models adjusted for intake of hypnotics and alcohol, gender, age and within-person variability. Results. Hours of daylight were found to be associated to self-reported bedtime (p = 0.032) and DSI (p = 0.030), thereby indicating a circa-annual variation. Bedtime was delayed by 1.8 min (95% CI: 0.6-2.9 min) per 1 hour increase in length of daylight. Sleep was slightly more disturbed during the winter. Conclusion. Only circa-annual variation in self-reports of bedtime and DSI were observed in a healthy daytime working population, and the effects were small. Therefore potential bias due to circa-annuality in the studied parameters appears to be of limited concern in adult daytime working populations.}},
author = {{Garde, Anne Helene and Hansen, Åse Marie and Persson, Roger and Österberg, Kai and Ørbæk, Palle and Karlson, Björn and Olsen, Annemarie and Kristiansen, Jesper}},
issn = {{1502-7686}},
keywords = {{Sleep quality; circa-annual variation; human; sleep duration}},
language = {{eng}},
number = {{6}},
pages = {{527--535}},
publisher = {{Informa Healthcare}},
series = {{Scandinavian Journal of Clinical & Laboratory Investigation}},
title = {{Month-to-month variation in sleep among healthy, Scandinavian daytime workers}},
url = {{http://dx.doi.org/10.3109/00365513.2014.913303}},
doi = {{10.3109/00365513.2014.913303}},
volume = {{74}},
year = {{2014}},
}