Citation

Miyata S, Noda A, Kawai S, Honda K, Iwamoto K, Ozaki N, Miyazaki S, Kondo T. Biol. Rhythm Res. 2019; 50(2): 171-179.

Copyright

(Copyright © 2019, Informa - Taylor and Francis Group)

DOI

10.1080/09291016.2018.1433467

PMID

unavailable

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.

Language: en

Keywords

CPT: continuous performance test; EDS: excessive daytime sleepiness; ESS: Epworth sleepiness scale; excessive daytime sleepiness; Near-infrared spectroscopy; NIRS: near-infrared spectroscopy; oxyHb: oxyhemoglobin; short sleep duration; TST: total sleep time; working memory