Changes in subjective sleep quality, attention, and work efficiency after waking up by light exposure before bedtime in young men without sleep disorders

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  • UCHIUMI Takuya
    Department of Occupational Therapy, Yamagata College of Medical Arts & Sciences
  • ISHIZAWA Masao
    Department of Occupational Therapy, Yamagata College of Medical Arts & Sciences
  • TAKAHATA Miki
    Area of Occupational Therapy, Graduate School of Health Sciences, Yamagata Prefectural University Health Sciences
  • YAMAKI Michiyasu
    Area of Occupational Therapy, Graduate School of Health Sciences, Yamagata Prefectural University Health Sciences
  • SATO Toshiaki
    Area of Occupational Therapy, Graduate School of Health Sciences, Yamagata Prefectural University Health Sciences

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Other Title
  • 睡眠障害を有さない若年男性における就寝前の光照射による起床後の主観的睡眠感，注意力および作業効率の変化
  • 睡眠障害を有さない若年男性における就寝前の光照射による起床後の主観的睡眠感,注意力および作業効率の変化 : 白熱電球と青色光の比較
  • スイミン ショウガイ オ ユウサナイ ジャクネン ダンセイ ニ オケル シュウシン マエ ノ ヒカリ ショウシャ ニ ヨル キショウ ゴ ノ シュカンテキ スイミンカン,チュウイリョク オヨビ サギョウ コウリツ ノ ヘンカ : ハクネツ デンキュウ ト セイショクコウ ノ ヒカク
  • A comparison of incandescent lamp and blue light
  • 白熱電球と青色光の比較

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Abstract

<p>Purpose: To investigate the effects of blue light exposure before bedtime on subjective sleep quality, attention, and work efficiency in young men without sleep disturbances.</p><p>Methods: A total of 12 young men (aged 20–23 years) without sleeping disorders were exposed to two conditions: 1) incandescent lamp and 2) blue light for 1 h before bedtime. The sleep status was monitored using a mat-type sleepmeter. The next morning after exposure, subjective sleep quality, attention, and work efficiency were measured. Subjective sleep quality was measured using the Oguri-Shirakawa-Azumi sleep inventory (MA version), attention using the psychomotor vigilance task, and work efficiency using the Purdue Peg board.</p><p>Results: This study revealed no significant difference in the subjective sleep quality between two conditions of incandescent lamp and blue lights. Additionally, sleep duration remains unchanged; however, the rate of deep sleep was significantly reduced. Work efficiency was also significantly reduced with blue light compared to incandescent lamp. Moreover, the reaction time of blue light attention significantly extended in the last 5-min of the 10-min measurement time.</p><p>Conclusion: The results of this study suggest that blue light exposure before bedtime may reduce an individual’s attention and work efficiency on the following day.</p>

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