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0198 The Effects of Intermittent Light on Sleepiness, Sleep Quality and Sleep Inertia

Sleep (New York, N.Y.), 2018-04, Vol.41 (suppl_1), p.A77-A78 [Peer Reviewed Journal]

Sleep Research Society 2018. Published by Oxford University Press [on behalf of the Sleep Research Society]. All rights reserved. For permissions, please email: journals.permissions@oup.com 2018 ;Copyright © 2018 Sleep Research Society ;ISSN: 0161-8105 ;EISSN: 1550-9109 ;DOI: 10.1093/sleep/zsy061.197

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  • Title:
    0198 The Effects of Intermittent Light on Sleepiness, Sleep Quality and Sleep Inertia
  • Author: Ji, Y ; Yang, C M ; Yang, M ; Zhu, Y ; Chen, Q ; Zhou, G ; Mao, T ; Yao, Y ; Dong, Q
  • Subjects: Light ; Quality ; Sleep deprivation
  • Is Part Of: Sleep (New York, N.Y.), 2018-04, Vol.41 (suppl_1), p.A77-A78
  • Description: Abstract Introduction To explore the effects of intermittent light in the evening on sleepiness, sleep quality, and sleep inertia, we compared sleepiness, assessed by KSS, self-evaluated sleep quality using VAS and subsequent sleep inertia measured by KSS, PANAS, PVT, and facial expression recognition task among three conditions of light exposure (for 3 hours): intermittent bright light (30-minute pulse of bright light [~1000 lux] alternating with 30-minute dim light [~5 lux] for three times), continuous bright light, and continuous dim light. Methods Fifteen healthy participants (20 ± 3.4 years; 7 males) were included and scheduled to stay in sleep laboratory for 4 nights (one for adaptation), with a period of one week between nights. Baseline levels of sleepiness, emotion and performance for sleep inertia were measured after subjects came to lab, followed by 2 hours of goggle wearing to dispel effects of daytime light. Then, sleepiness just was assessed before and after light exposure. Subjects were then allowed to go to sleep at habitual bedtime. Upon awakening, sleepiness, emotion, performance and sleep quality were measured immediately. Results Differences in the changes of sleepiness from before light exposure to after light exposure were significant (F (2,28) =3.515, p =.043, η2 =.201), with changes smaller in intermittent condition than in continuous (p =.01) and dim (p =.036) light conditions. However, the main effects of lighting conditions on sleep quality were not significant. As for sleep inertia, compared with baseline levels, in the morning, KSS scores were higher (F (1,14) =19.547, p =.001, η2=.583), with scores of positive subscale of PANAS lower (F (1,14) =14.851, p=.002, η2 =.515), the lapses and median RTs in PVT significantly larger and the accuracies smaller in intermittent (p =.019) and dim (p =.021) light conditions in facial expression task. Conclusion Intermittent light exposure was more effective than continuous light in attenuating the increase of sleepiness along the night, but exposing to bright light in the evening did not influence self-reported sleep quality, neither strengthened sleep inertia intensity. Support (If Any) the National Key R&D Program of China (2016YFB0404202).
  • Publisher: US: Oxford University Press
  • Language: English
  • Identifier: ISSN: 0161-8105
    EISSN: 1550-9109
    DOI: 10.1093/sleep/zsy061.197
  • Source: ProQuest One Psychology
    AUTh Library subscriptions: ProQuest Central
    Alma/SFX Local Collection
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