CoChat
Sign Up
Cited by 5Sleep and related disordersCircadian rhythm and melatoninPhysical Activity and Health

Shuteye Time Compared With Bedtime: Misclassification of Sleep in Adolescent Females

Haszard, Jillian J., Scott, Tessa, Smith, Claire, Peddie, Meredith C.·2021·Journal for the Measurement of Physical Behaviour
DOI 10.1123/jmpb.2020-0042
Open this paper in CoChat — free account

Abstract

Short sleep duration is associated with poorer outcomes for adolescents; however, sleep duration is often assessed (either by questionnaire or device) using self-reported bedtime (i.e., the time a person goes to bed). With sedentary activities, such as screen time, being common presleep in-bed behaviors, the use of “bedtime” may introduce error to the estimates of sleep duration. It has been proposed that self-reported “shuteye time” (i.e., the time a person starts trying to go to sleep) is used instead of bedtime. This study aimed to compare the bedtimes and shuteye times of a sample of 15- to 18-year-old female adolescents recruited from 13 high schools across New Zealand. The influence on sleep duration estimates and associations with healthy lifestyle habits was also examined. Sleep data were collected from 136 participants using actigraphy and self-report. On average, 52 min (95% confidence interval [43, 60] min) of sedentary time was misclassified as sleep when bedtime was used instead of shuteye time with actigraph data. Mean bedtimes on weekdays and weekends were 9:56 p.m. (SD = 58 min) and 10:40 p.m. (SD = 77 min), respectively. The relationship between bedtime and shuteye time was not linear—indicating that bedtime cannot be used as a proxy for shuteye time. Earlier shuteye times were more strongly associated with meeting fruit and vegetable intake and sleep and physical activity guidelines than earlier bedtimes. Using bedtime instead of shuteye time to estimate sleep duration may introduce substantial error to estimates of both sleep and sedentary time.

Integrity signals

Registry

Crossref · 10.1123/jmpb.2020-0042

Cites

19 of 19 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

We couldn’t retrieve this paper’s full text, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • The study had objective measures of sleep via accelerometry and objectively measured screen time from getting into bed until shut-eye using infrared night vision video cameras.

    “We had objective measures of sleep via accelerometry and objectively measured screen time from getting into bed until shut-eye (the shut-eye latency period) using infrared night vision video cameras, a bedtime period often missed or mischaracterized in sleep research.49,50”

    From Screen Use at Bedtime and Sleep Duration and Quality Among Youths (2024) · cites this paper as [50]

  • Bedtime is not synonymous with attempts to sleep straightaway in the modern world.

    “Examining the interval from retiring to bed until attempting sleep (shut-eye latency) separately from bedtime is important, as bedtime is not synonymous with attempts to sleep straightaway in the modern world.41”

    From Screen Use at Bedtime and Sleep Duration and Quality Among Youths (2024) · cites this paper as [41]

Cites

Flagged first, then by citations

1 of the 20 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Related

Authors
Haszard, J. J., Scott, T., Smith, C., & Peddie, M. C.
Affiliations
University of Otago (NZ)
ORCID
Venue
Journal for the Measurement of Physical Behaviour
Publisher
Human Kinetics
Published
2021-06-01
Volume
4
Issue
2
Pages
137-142
ISSN
  • 2575-6605 (ISSN-L)
  • 2575-6613
DOI
10.1123/jmpb.2020-0042
OpenAlex
W3155225474
Cited by
5
References
20
Citations by year
2026: 1 · 2024: 3 · 2022: 1
FWCI
0.97
Type
journal article
Language
en
Open access
closed
Locations
Journal for the Measurement of Physical Behaviour (publishedVersion)
Topics
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
Keywords
bedtime, sleep duration, misclassification, sedentary behavior, screen time, adolescents, actigraphy, self-reported sleep, sleep timing, fruit and vegetable intake, physical activity, healthy lifestyle habits

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review