Adolescents Living in Homes Without Electric Lighting Have Earlier Sleep Times
Abstract
The aim of this project was to compare circadian rhythmicity of a group of 37 adolescents (14 girls), aged 11 to 16 (mean age = 13.1 +/- 1.7 years), with and without electricity at home. Twenty students attended morning school (07:30-11:30), and 17 attended evening school classes (19:00-22:30). Eleven adolescents had no electric lighting at home (5 attended morning classes and 6 attended evening classes). They completed a sleep log and wore a wrist actigraph for 5 consecutive days. Saliva samples were collected to assess DLMO. Data were compared by ANOVA and showed later timing and a more extended sleep period for those who attended late classes. Those adolescents without electricity at home had significantly earlier sleep onset on school days. As to DLMO, a trend to a delay was observed in the groups who had electric lighting.
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
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?
Adolescents in Brazil who did not have electrical lighting at home had significantly earlier sleep onsets and less sleep deprivation than their peers.
“Indeed, a recent study found that adolescents in Brazil who did not have electrical lighting at home had significantly earlier sleep onsets and less sleep deprivation than their peers [146].”
From The neuroendocrine control of the circadian system: Adolescent chronotype (2012) · cites this paper as [146]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
The citation lists haven’t been fetched yet
References 25 · Cited by 79
- Authors
- Peixoto, C. A. T., da Silva, A. G. T., Carskadon, M. A., & Louzada, F. M.
- Affiliations
- Universidade Federal do Paraná (BR)
- Brown University (US)
- Venue
- Behavioral Sleep Medicine
- Publisher
- Informa UK Limited
- Published
- 2009-03-25
- Volume
- 7
- Issue
- 2
- Pages
- 73-80
- ISSN
- 1540-2002 (ISSN-L)
- 1540-2010
- OpenAlex
- W2016233244
- Cited by
- 79
- References
- 25
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 1 · 2023: 6 · 2022: 11 · 2021: 2 · 2020: 6 · 2019: 3 · 2018: 5 · 2017: 6 · 2016: 5 · 2015: 8 · 2014: 6 · 2013: 3 · 2012: 4
- FWCI
- 1.50
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Behavioral Sleep Medicine (publishedVersion)
- PubMed (publishedVersion)
- Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion)
- Funders
- Sleep Research Society Foundation
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Universidade Federal do Paraná
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Keywords
- adolescents, circadian rhythm, sleep timing, electric lighting, school start time, evening classes, sleep onset, dim light melatonin onset, actigraphy, sleep diary
- MeSH terms
- Adolescent, Adolescent Behavior, Child, Circadian Rhythm, Female, Humans, Lighting, Male, Melatonin, Saliva, Time Factors
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
