自己覚醒が夜間睡眠と起床後の覚醒度に及ぼす影響 <学位論文要旨>

Effects of self-awakening on nocturnal sleep and on arousal levels after awakening <Summaries of the Doctoral Theses>

Ikeda Hiroki

広島大学大学院総合科学研究科紀要. I, 人間科学研究

Bulletin of the Graduate School of Integrated Arts and Sciences, Hiroshima University. I, Studies in human sciences

This doctoral dissertation aimed to assess the effects of self-awakening on arousal levels immediately after awakening and during the day, and to clarify the mechanisms underlying these effects. Chapter 1 includes the aims of this doctoral dissertation and a review of previous studies on self-awakening. Chapter 2 shows how self-awakening barely disturbs nocturnal sleep but reduces sleep inertia immediately after awakening. The data included in chapter 3 show that sigma band power gradually decreased during sleep stage 2 before self-awakening. The sigma band power reflects sleep spindle activity, which plays a role in maintaining sleep. These findings suggest that sleep maintenance gradually decreases before self-awakening and that this phenomenon decreases sleep inertia. Chapter 4 describes how self-awakening decreases daytime sleepiness and fatigue. Chapter 5 shows that the accuracy of time assessment during sleep increases when attempting self-awakening. This accurate time assessment during sleep may cause awakening from sleep at a predetermined time. Chapter 6 includes the conclusion, i.e., self-awakening is useful for preventing sleepiness in daily life and that attempting self-awakening, which enables accurate time estimation during sleep and reduces sleep maintenance before awakening, also enables the individual to accurately awaken at a predetermined time.

Psychology [ 140 ]

jpn

広島大学大学院総合科学研究科

Copyright (c) 2010 by Graduate School of Integrated Arts and Sciences, Hiroshima University All rights reserved

[ISSN] 1881-7688

[NCID] AA12198647