Sleep and physiological dysregulation: a closer look at sleep intraindividual variability

Journal article


Bei, Bei, Seeman, Teresa E., Carroll, Judith E. and Wiley, Joshua 2017. Sleep and physiological dysregulation: a closer look at sleep intraindividual variability. Sleep. 40 (9), pp. 1 - 10. https://doi.org/10.1093/sleep/zsx109
AuthorsBei, Bei, Seeman, Teresa E., Carroll, Judith E. and Wiley, Joshua
Abstract

Study Objectives Variable daily sleep (ie, higher intraindividual variability; IIV) is associated with negative health consequences, but potential physiological mechanisms are poorly understood. This study examined how the IIV of sleep timing, duration, and quality is associated with physiological dysregulation, with diurnal cortisol trajectories as a proximal outcome and allostatic load (AL) as a multisystem distal outcome. Methods Participants are 436 adults (Mage ± standard deviation = 54.1 ± 11.7, 60.3% women) from the Midlife in the United States study. Sleep was objectively assessed using 7-day actigraphy. Diurnal cortisol was measured via saliva samples (four/day for 4 consecutive days). AL was measured using 23 biomarkers from seven systems (inflammatory, hypothalamic–pituitary–adrenal axis, metabolic glucose and lipid, cardiovascular, parasympathetic, sympathetic) using a validated bifactor model. Linear and quadratic effects of sleep IIV were estimated using a validated Bayesian model. Results Controlling for covariates, more variable sleep timing (p = .04 for risetime, p = .097 for bedtime) and total sleep time (TST; p = .02), but not mean sleep variables, were associated with flatter cortisol diurnal slope. More variable sleep onset latency and wake after sleep onset, later average bedtime, and shorter TST were associated with higher AL adjusting for age and sex (p-values < .05); after controlling for all covariates, however, only later mean bedtime remained significantly associated with higher AL (p = .04). Conclusions In a community sample of adults, more variable sleep patterns were associated with blunted diurnal cortisol trajectories but not with higher multisystem physiological dysregulation. The associations between sleep IIV and overall health are likely complex, including multiple biopsychosocial determinants and require further investigation.

Year2017
JournalSleep
Journal citation40 (9), pp. 1 - 10
PublisherAssociated Professional Sleep Societies, Llc
ISSN0161-8105
Digital Object Identifier (DOI)https://doi.org/10.1093/sleep/zsx109
Scopus EID2-s2.0-85030552465
Page range1 - 10
Research GroupMary MacKillop Institute for Health Research
Place of publicationUnited States
EditorsD. Geffen
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