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Original Paper

Blue-Enriched Morning Light as a Countermeasure to Light at the Wrong Time: Effects on Cognition, Sleepiness, Sleep, and Circadian Phase

Münch M.a, c · Nowozin C.a, c · Regente J.a, b · Bes F.a, c · De Zeeuw J.a · Hädel S.a · Wahnschaffe A.a, c · Kunz D.a, c

Author affiliations

aSleep Research and Clinical Chronobiology, Institute of Physiology, and bDepartment of Psychiatry and Psychotherapy, Campus Charité Mitte, Charité Universitätsmedizin Berlin, and cClinic for Sleep and Chronomedicine, St. Hedwig Hospital, Berlin, Germany

Related Articles for ""

Neuropsychobiology 2016;74:207-218

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: March 17, 2017
Accepted: April 25, 2017
Published online: June 22, 2017
Issue release date: July 2017

Number of Print Pages: 12
Number of Figures: 3
Number of Tables: 1

ISSN: 0302-282X (Print)
eISSN: 1423-0224 (Online)

For additional information: http://www.karger.com/NPS

Abstract

Light during the day and darkness at night are crucial factors for proper entrainment of the human circadian system to the solar 24-h day. However, modern life and work styles have led to much more time spent indoors, often with lower daytime and higher evening/nighttime light intensity from electrical lighting than outdoors. Whether this has long-term consequences for human health is being currently investigated. We tested if bright blue-enriched morning light over several days could counteract the detrimental effects of inadequate daytime and evening lighting. In a seminaturalistic, within-between subject study design, 18 young participants were exposed to different lighting conditions on 3 evenings (blue-enriched, bright orange, or dim light), after exposure to 2 lighting conditions (mixed blue-enriched light and control light, for 3 days each) in the mornings. Subjective sleepiness, reaction times, salivary melatonin concentrations, and nighttime sleep were assessed. Exposure to the blue-enriched morning lighting showed acute wake-promoting effects and faster reaction times than with control lighting. Some of these effects persisted until the evening, and performance improved over several days. The magnitude of circadian phase shifts induced by combinations of 3 different evening and 2 morning lighting conditions were significantly smaller with the blue-enriched morning light. During the night, participants had longer total sleep times after orange light exposure than after blue light exposure in the evening. Our results indicate that bright blue-enriched morning light stabilizes circadian phase, and it could be an effective counterstrategy for poor lighting during the day and also light exposure at the wrong time, such as in the late evening.

© 2017 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: March 17, 2017
Accepted: April 25, 2017
Published online: June 22, 2017
Issue release date: July 2017

Number of Print Pages: 12
Number of Figures: 3
Number of Tables: 1

ISSN: 0302-282X (Print)
eISSN: 1423-0224 (Online)

For additional information: http://www.karger.com/NPS


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