The DOI matches its Crossref record; 78 of the 79 references it cites were found in a registry or an index.
Does one hour of bright or short-wavelength filtered tablet screenlight have a meaningful effect on adolescents’ pre-bedtime alertness, sleep, and daytime functioning?
Abstract
Electronic media use is prevalent among adolescent populations, as is the frequency of sleeplessness. One mechanism proposed for technology affecting adolescents' sleep is the alerting effects from bright screens. Two explanations are provided. First, screens emit significant amounts of short-wavelength light (i.e. blue), which produces acute alertness and alters sleep timing. Second, later chronotypes are hypothesised to be hypersensitive to evening light. This study analysed the pre-sleep alertness (GO/NOGO task speed, accuracy; subjective sleepiness), sleep (sleep diary, polysomnography), and morning functioning of 16 healthy adolescents (M = 17.4 ± 1.9 yrs, 56% f) who used a bright tablet screen (80 lux), dim screen (1 lux) and a filtered short-wavelength screen (f.lux; 50 lux) for 1 hr before their usual bedtime in a within-subjects protocol. Chronotype was analysed as a continuous between-subjects factor; however, no significant interactions occurred. Significant effects occurred between bright and dim screens for GO/NOGO speed and accuracy. However, the magnitude of these differences was small (e.g. GO/NOGO speed = 23 ms, accuracy = 13%), suggesting minimal clinical significance. No significant effects were found for sleep onset latency, slow-rolling eye movements, or the number of SWS and REM minutes in the first two sleep cycles. Future independent studies are needed to test short (1 hr) vs longer (>2 hrs) screen usage to provide evidence for safe-to-harmful levels of screenlight exposure before adolescents' usual bedtime.
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“others failed to show consistent beneficial effects [46], or suggested additional interfering factors such as display brightness [47].”
From Preliminary Results: The Impact of Smartphone Use and Short-Wavelength Light during the Evening on Circadian Rhythm, Sleep and Alertness (2021) · cites this paper as [46]
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Lemola, S., Perkinson-Gloor, N., Brand, S., Dewald-Kaufmann, J. F., & Grob, A. (2015) · Journal of Youth and Adolescence · doi:10.1007/s10964-014-0176-x · Cited by 940
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Self-citationYouth Screen Media Habits and Sleep
Hale, L., Kirschen, G. W., LeBourgeois, M. K., Gradisar, M., Garrison, M. M., Montgomery-Downs, H., Kirschen, H., McHale, S. M., Chang, A.-M., & Buxton, O. M. (2018) · Child and Adolescent Psychiatric Clinics of North America · doi:10.1016/j.chc.2017.11.014 · Cited by 312
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Metadata
- Authors
- Heath, M., Sutherland, C., Bartel, K., Gradisar, M., Williamson, P., Lovato, N., & Micic, G.
- Affiliations
- Flinders University (AU)
- Corresponding author
- Gradisar, Michael
- Venue
- Chronobiology International
- Publisher
- Informa UK Limited
- Published
- 2014-01-07
- Volume
- 31
- Issue
- 4
- Pages
- 496-505
- ISSN
- 0742-0528 (ISSN-L)
- 1525-6073
- OpenAlex
- W2161789805
- Cited by
- 122
- References
- 79
- Citations by year
- 2026: 4 · 2025: 7 · 2024: 9 · 2023: 8 · 2022: 18 · 2021: 9 · 2020: 5 · 2019: 14 · 2018: 10 · 2017: 12 · 2016: 13 · 2015: 5 · 2014: 8
- FWCI
- 17.59
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Chronobiology International (publishedVersion)
- PubMed (publishedVersion)
- 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
- blue light, short-wavelength light, adolescents, sleep latency, chronotype, sleep quality, daytime functioning, go/no-go task, sleepiness, screen time before bedtime
- MeSH terms
- Activities of Daily Living, Activity Cycles, Adolescent, Adolescent Behavior, Age Factors, Cognition, Humans, Light, Male, Surveys and Questionnaires, Sleep Stages, Time Factors, Wakefulness, Polysomnography, Photoperiod, Computers, Handheld, Young Adult
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