Change search
ReferencesLink to record
Permanent link

Direct link
Two hours of evening reading on a self-luminous tablet vs. reading a physical book does not alter sleep after daytime bright light exposure
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Functional Pharmacology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience.
Show others and affiliations
2016 (English)In: Sleep Medicine, ISSN 1389-9457, E-ISSN 1878-5506, Vol. 23, 111-118 p.Article in journal (Refereed) Published
Abstract [en]

Background: The use of electronic devices emitting blue light during evening hours has been associated with sleep disturbances in humans, possibly due to the blue light-mediated suppression of the sleep promoting hormone melatonin. However, experimental results have been mixed. The present study therefore sought to investigate if reading on a self-luminous tablet during evening hours would alter sleepiness, melatonin secretion, nocturnal sleep, as well as electroencephalographic power spectral density during early slow-wave sleep. Methods: Following a constant bright light exposure over 6.5 hours (similar to 569 lux), 14 participants (six females) read a novel either on a tablet or as physical book for two hours (21:00-23:00). Evening concentrations of saliva melatonin were repeatedly measured. Sleep (23:15-07:15) was recorded by polysomnography. Sleepiness was assessed before and after nocturnal sleep. About one week later, experiments were repeated; participants who had read the novel on a tablet in the first experimental session continued reading the same novel in the physical book, and vice versa. Results: There were no differences in sleep parameters and pre-sleep saliva melatonin levels between the tablet reading and physical book reading conditions. Conclusions: Bright light exposure during daytime has previously been shown to abolish the inhibitory effects of evening light stimulus on melatonin secretion. Our results could therefore suggest that exposure to bright light during the day - as in the present study - may help combat sleep disturbances associated with the evening use of electronic devices emitting blue light. However, this needs to be validated by future studies with larger sample populations.

Place, publisher, year, edition, pages
2016. Vol. 23, 111-118 p.
Keyword [en]
Evening LED screen exposure, Saliva melatonin, Sleep, Power spectral density, Daytime light exposure
National Category
Neurology Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-308796DOI: 10.1016/j.sleep.2016.06.016ISI: 000386409000016PubMedID: 27539026OAI: oai:DiVA.org:uu-308796DiVA: diva2:1051409
Funder
AFA InsuranceNovo NordiskThe Swedish Brain FoundationSwedish Research Council
Available from: 2016-12-01 Created: 2016-11-30 Last updated: 2016-12-02Bibliographically approved

Open Access in DiVA

fulltext(1185 kB)3 downloads
File information
File name FULLTEXT01.pdfFile size 1185 kBChecksum SHA-512
ac686ba39c3f7fb158d086d72ced0c4c16d406328c6e9efeaae5c7c203fab3817e30de4e43b4a1cd3b70a406e588ee0c12c688e64d59ddcddf923f426aeaf714
Type fulltextMimetype application/pdf

Other links

Publisher's full textPubMed

Search in DiVA

By author/editor
Rångtell, Frida H.Lingfors, David H. S.Jan-Erik, BromanSchiöth, Helgi B.Benedict, Christian
By organisation
Functional PharmacologyDepartment of NeuroscienceSolid State PhysicsPsychiatry, University Hospital
In the same journal
Sleep Medicine
NeurologyEngineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 3 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

ReferencesLink to record
Permanent link

Direct link