@article{ref1,
title="Delayed sleep/wake rhythm and excessive daytime sleepiness correlate with decreased daytime brain activity during cognitive task in university students",
journal="Biological rhythm research",
year="2019",
author="Miyata, Seiko and Noda, Akiko and Kawai, Sayumi and Honda, Kumiko and Iwamoto, Kunihiro and Ozaki, Norio and Miyazaki, Soichiro and Kondo, Takaharu",
volume="50",
number="2",
pages="171-179",
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.<p /> <p>Language: en</p>",
language="en",
issn="0929-1016",
doi="10.1080/09291016.2018.1433467",
url="http://dx.doi.org/10.1080/09291016.2018.1433467"
}