Delayed sleep/wake rhythm and excessive daytime sleepiness correlate with decreased daytime brain activity during cognitive task in university students |
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Authors: | Seiko Miyata Sayumi Kawai Kumiko Honda Kunihiro Iwamoto Norio Ozaki |
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Institution: | 1. Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Japan;2. Department of Biomedical Sciences, Chubu University College of Life and Health Sciences, Kasugai, Japan |
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Abstract: | Insufficient sleep and irregular sleep/wake rhythm are common problems among university students. We investigated the effect of sleep/wake rhythm and excessive daytime sleepiness (EDS) on the cortical oxygenation as measured by near-infrared spectroscopy (NIRS) and cognitive performance in university students. Peak- and integral values by a word fluency task were measured with NIRS. EDS was evaluated by the Epworth sleepiness scale (ESS), and performance function was evaluated using N-back task. Peak cerebral oxygenation was significantly correlated with ESS, bedtime, wake-up time, and median time of sleep. Accuracy on 2-back task was significantly correlated with integral value. Peak- and integral values were significantly lower, and bedtime and median time of sleep were significantly delayed in the EDS group than in the non-EDS group. EDS accompanied by delayed sleep/wake rhythm and short sleep duration may play an important role in decreasing daytime brain activity and cognitive performance. |
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Keywords: | Near-infrared spectroscopy short sleep duration excessive daytime sleepiness working memory |
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