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Does one hour of bright or short-wavelength filtered tablet screenlight have a meaningful effect on adolescents’ pre-bedtime alertness, sleep, and daytime functioning?

Heath, Melanie, Sutherland, Cate, Bartel, Kate, Gradisar, Michael, Williamson, Paul, Lovato, Nicole, Micic, Gorica·2014·Chronobiology International

DOI 10.3109/07420528.2013.872121

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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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Authors: Heath, M., Sutherland, C., Bartel, K., Gradisar, M., Williamson, P., Lovato, N., & Micic, G.
Affiliations: Flinders University (AU)
Corresponding author: Gradisar, Michael
ORCID: Bartel, Kate
Gradisar, Michael
Williamson, Paul
Lovato, Nicole
Micic, Gorica
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
DOI: 10.3109/07420528.2013.872121
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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Does one hour of bright or short-wavelength filtered tablet screenlight have a meaningful effect on adolescents’ pre-bedtime alertness, sleep, and daytime functioning?

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