Lenneis, Anita (2021) Sleep timing : variability and stability, influences, and outcomes. PhD thesis, University of Warwick.

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Abstract

Sleep timing, i.e., chronotype, can be conceptualised as mid-sleep which is the mid-point between sleep onset and wake-up time. This thesis aims to further explore the construct by assessing changes in sleep timing, the influence of the five-factor model (FFM) personality traits on sleep timing, and the influence of sleep timing on subjective well-being (outcome).

The thesis uses data from an experience sampling study of British university students and a large-scale sample of participants from the Estonian Biobank. Chapter 2 assesses the intraindividual variability of mid-sleep, using a two-week long sleep diary, and temporal stability of mid-sleep on free and workdays of up to five years, by examining their test-retest correlations. Chapter 3 examines the relationship between the FFM personality traits and chronotype on the phenotypic and genetic level using personality and chronotype questionnaires and polygenic scores. Participants of the experience sampling study also provided multiple daily measures of subjective well-being (Chapter 4) allowing the analysis of the influence of sleep timing and other sleep indicators on subjective well-being.

The intraindividual variability of mid-sleep was smaller than the interindividual variability of mid-sleep once the effect of free and workdays was accounted for. The temporal stability of mid-sleep on both free and workdays was strong, but largely dependent on participants’ age. The FFM personality traits and chronotype were related at all three levels of the personality hierarchy (i.e., domains, facets, and items) and seemed to share underlying genetic mechanisms. Sleep satisfaction, but not sleep timing, influenced all three components of next day’s subjective well-being.

The findings of the thesis offer a wide range of practical implications which could lead to an overall improvement of people’s well-being. The thesis closes with directions for future studies that can dive deeper into better understanding sleep timing and its associated factors and outcomes.

Item Type:	Thesis or Dissertation (PhD)
Subjects:	B Philosophy. Psychology. Religion > BF Psychology Q Science > QP Physiology
Library of Congress Subject Headings (LCSH):	Sleep-wake cycle, Sleep -- Stages, Big Five model
Official Date:	January 2021
Dates:	Date Event January 2021 UNSPECIFIED
Institution:	University of Warwick
Theses Department:	Department of Psychology
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Realo, Anu, 1974- ; Lemola, Sakari
Format of File:	pdf
Extent:	xiv, 157 leaves : illustrations
Language:	eng

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