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. 2017 Mar-Apr;15(2):144-157.
doi: 10.1080/15402002.2015.1120200. Epub 2016 Jan 8.

Sleep Variability Among Older Adults With Insomnia: Associations With Sleep Quality and Cardiometabolic Disease Risk

Kelly Glazer Baron  1 , Kathryn J Reid  2 , Roneil G Malkani  2 , Joseph Kang  2 , Phyllis C Zee  2
Affiliations

Sleep Variability Among Older Adults With Insomnia: Associations With Sleep Quality and Cardiometabolic Disease Risk

Kelly Glazer Baron et al. Behav Sleep Med. 2017 Mar-Apr.

Abstract

Sleep variability has been linked to poor subjective sleep quality, but few studies have investigated effects on physical health. In this study, we evaluated cross sectional associations and change over time in objective sleep variability of adults with insomnia and short sleep duration who were participating in a non-pharmacologic intervention study. Results indicated greater variability in objective sleep measures were associated with poorer subjective sleep quality (p < 0.05). Higher sleep duration variability was associated with higher HbA1c (p < 0.01) and sleep onset time variability was associated with higher BMI (p < 0.05). Sleep efficiency and WASO variability decreased with intervention (p < 0.05). These results indicate that objective sleep variability may be an important feature for the assessment of insomnia outcomes.

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Figures

Figure 1
Figure 1
Panel a. Association between subjective sleep quality and objective variability in WASO at baseline. WASO= Wake After Sleep Onset, Acti= actigraphy variable. Panel b. Association between glycosylated hemoglobin (HbA1c) and objective variability in sleep duration at baseline (n=12). Acti= actigraphy variable. Panel c. Association between BMI and objective variability in sleep onset time at baseline. Acti= actigraphy variable.
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