Improving actigraphic sleep estimates in insomnia and dementia: how many nights?

VAN SOMEREN, EUS J. W.

doi:10.1111/j.1365-2869.2007.00592.x

Cited by 181Sleep and related disordersCircadian rhythm and melatoninSleep and Work-Related Fatigue

Improving actigraphic sleep estimates in insomnia and dementia: how many nights?

VAN SOMEREN, EUS J. W.·2007·Journal of Sleep Research

DOI 10.1111/j.1365-2869.2007.00592.x

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Summary: In order to investigate how the duration of actigraphic recordings affects the reliability of actigraphic estimates of sleep and 24‐h activity rhythm variables, two to 3 weeks of actigraphy were recorded, from which pairs of variables derived from two periods of increasing length (1–10 days) were compared. Two groups were studied: (1) 10 subjects suffering from primary insomnia; and (2) 12 demented elderly subjects living semi‐independently in group care facilities of homes for the elderly. Actigraphic estimates of primary measures of sleep (duration and efficiency) and of the 24‐h activity pattern (interdaily stability, intradaily variability and amplitude) were calculated on variable lengths of the actigraphic recordings. The average absolute difference of two estimates decreased – and reliability increased – strongly with an increasing number of days analysed. An acceptable reliability of the interdaily stability estimate required more than 7 days of recording. It can be concluded that a valuable improvement in the reliability of actigraphic sleep estimates can be obtained by simply increasing the number of recording nights. The results support the importance of day‐to‐day variability in insomnia and dementia that has already been previously noted by others, and even suggest the presence of ’week‐to‐week’ variability. This variability may have been involved in the equivocal results of treatment studies in insomnia and dementia where outcome measures were based on a limited number of nights. Such studies could profit from extension of the recording duration to, e.g. 2 weeks, and from the inclusion of variability measures as measures of clinical interest.

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Reliable long-term assessment of skin temperature in field studies has recently become as feasible as actigraphic assessments of sleep-wake rhythms has been for many years.
“Since the reliable long-term assessment of skin temperature in field studies has recently become as feasible as actigraphic assessments of sleep–wake rhythms has been for many years [82, 87, 90, 91], it would be of value to assess skin temperature profiles in large cohorts of people with and without sleep complaints.”
From Sleep, vigilance, and thermosensitivity (2012) · cites this paper as [87]

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Authors: VAN SOMEREN, E. J. W.
Venue: Journal of Sleep Research
Publisher: Wiley
Published: 2007-08-17
Volume: 16
Issue: 3
Pages: 269-275
ISSN: 0962-1105 (ISSN-L)
1365-2869
DOI: 10.1111/j.1365-2869.2007.00592.x
OpenAlex: W1977003964
Cited by: 181
References: 38
Citations by year: 2026: 6 · 2025: 3 · 2024: 13 · 2023: 2 · 2022: 8 · 2021: 16 · 2020: 17 · 2019: 16 · 2018: 15 · 2017: 7 · 2016: 10 · 2015: 9 · 2014: 7 · 2013: 16 · 2012: 7
FWCI: 8.55
Type: journal article
Language: en
Open access: closed
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor)
Locations: Journal of Sleep Research (publishedVersion)
PubMed (publishedVersion)
Funders: American Academy of Sleep Medicine
Vrije Universiteit Amsterdam
Topics: Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
Keywords: actigraphy, recording duration, primary insomnia, dementia, interdaily stability, intradaily variability, sleep efficiency, day-to-day variability, elderly residents
MeSH terms: Aged, Aged, 80 and over, Analysis of Variance, Circadian Rhythm, Dementia, Female, Humans, Sleep Initiation and Maintenance Disorders, Male, Middle Aged, Monitoring, Physiologic, Surveys and Questionnaires, Severity of Illness Index, Reproducibility of Results, Polysomnography, Sleep Disorders, Circadian Rhythm

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Improving actigraphic sleep estimates in insomnia and dementia: how many nights?

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