Journal article
Effect of evening blue light blocking glasses on subjective and objective sleep in healthy adults: A randomized control trial
Sleep health, Vol.7(4), pp.485-490
08/01/2021
DOI: 10.1016/j.sleh.2021.02.004
PMID: 33707105
Abstract
Objectives: Evening blue light has been shown to suppress melatonin, which can negatively impact sleep quality. The impact of evening blue light blocking (BLB) interventions on sleep remains ambiguous due to lack of randomized control trials. The present study tests the hypothesis that BLB glasses improve subjective and objective sleep in a population of healthy adults.
Design: Two-week, randomized, controlled, crossover design.
Setting: At-home testing of individuals in Michigan and Montana.
Participants: Twenty healthy adults (11 men, 9 women, age: 32 +/- 12, body mass index: 28 +/- 4 kg/m(2)).
Intervention: Following a 1-week run-in baseline (ie, no glasses), participants were randomized to 1-week of BLB or control (ie, clear lens) glasses. Upon finishing the 1-week intervention, participants crossed over to the opposite condition. In both conditions, glasses were worn for 7 consecutive days from 6 PM until bedtime.
Measurements: Objective sleep parameters were obtained using wrist actigraphy. Subjective sleep measures were assessed using sleep diaries. Karolinska Sleep Diaries were used to assess perceived sleep quality.
Results: BLB reduced subjective sleep onset (21 +/- 28 vs 24 +/- 21 minute, P = .033) and awakenings (1.6 +/- 1.0 vs 2.2 +/- 1.0 awakenings, P = .019) compared to the control condition. In contrast, objective measures of sleep were not significantly impacted. In fact, our primary outcome variable of total sleep time (TST) tended to be paradoxically shorter in the BLB condition for both subjective (468 +/- 45 vs 480 +/- 48 minute, P = .066) and objective (433 +/- 40 vs 449 +/- 39 minute, P = .075) TST.
Conclusions: Blue light blocking glasses did not improve objective measures of sleep time or quality in healthy adults. (C) 2021 National Sleep Foundation. Published by Elsevier Inc. All rights reserved.
Details
- Title: Subtitle
- Effect of evening blue light blocking glasses on subjective and objective sleep in healthy adults: A randomized control trial
- Creators
- Jeremy A. Bigalke - Montana State UniversityIan M Greenlund - Montana State UniversityJennifer R. Nicevski - Montana State UniversityJason R. Carter - Montana State University
- Resource Type
- Journal article
- Publication Details
- Sleep health, Vol.7(4), pp.485-490
- DOI
- 10.1016/j.sleh.2021.02.004
- PMID
- 33707105
- NLM abbreviation
- Sleep Health
- ISSN
- 2352-7218
- eISSN
- 2352-7226
- Publisher
- Elsevier
- Number of pages
- 6
- Language
- English
- Date published
- 08/01/2021
- Academic Unit
- Health, Sport, and Human Physiology
- Record Identifier
- 9985219296602771
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