title: Predictors of Nightly Subjective-Objective Sleep Discrepancy in Poor Sleepers over a Seven-Day Period.
abstract: This study sought to examine predictors of subjective/objective sleep discrepancy in poor sleepers. Forty-two individuals with insomnia symptoms (mean age = 36.2 years, 81% female) were recruited to take part in a prospective study which combined seven days of actigraphy with daily assessment of sleep perceptions, self-reported arousal, sleep effort, and mood upon awakening. A high level of intra-individual variability in measures of sleep discrepancy was observed. Multilevel modelling revealed that higher levels of pre-sleep cognitive activity and lower mood upon awakening were significantly and independently predictive of the underestimation of total sleep time. Greater levels of sleep effort predicted overestimation of sleep onset latency. These results indicate that psychophysiological variables are related to subjective/objective sleep discrepancy and may be important therapeutic targets in the management of insomnia.
authors.affiliation: Division of Psychology and Mental Health, School of Health Sciences, University of Manchester, Manchester Academic Health Science Centre, Manchester M13 9PL, UK. Vanessa.Herbert@postgrad.manchester.ac.uk.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Herbert
authors.affiliation: Division of Psychology and Mental Health, School of Health Sciences, University of Manchester, Manchester Academic Health Science Centre, Manchester M13 9PL, UK. Daniel.Pratt@manchester.ac.uk.|Centre for New Treatments and Understanding in Mental Health (CeNTrUM), University of Manchester, Manchester Academic Health Science Centre, Manchester M13 9PL, UK. Daniel.Pratt@manchester.ac.uk.
authors.forename: Daniel
authors.initials: D
authors.lastname: Pratt
authors.affiliation: Centre for Biostatistics, School of Health Sciences, University of Manchester, Manchester Academic Health Science Centre, Manchester M13 9PL, UK. Richard.Emsley@manchester.ac.uk.
authors.forename: Richard
authors.initials: R
authors.lastname: Emsley
authors.affiliation: Sleep and Circadian Neuroscience Institute (SNCI), Nuffield Department of Clinical Neuroscience, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3PA, UK. Simon.Kyle@ndcn.ox.ac.uk.
authors.forename: Simon D
authors.initials: SD
authors.lastname: Kyle
keywords: insomnia; misperception; subjective/objective sleep discrepancy