Journal
BRAIN & DEVELOPMENT
Volume 31, Issue 4, Pages 255-273Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.braindev.2008.07.006
Keywords
Desynchronization; Serotonin; Morningness; Eveningness; Sleep; Circadian rhythm
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The bedtime of preschoolers/pupils/students in Japan has become progressively later with the result sleep duration has become progressively shorter, With these changes, more than half of the preschoolers/pupils/students in Japan recently have complained of daytime sleepiness, while approximately one quarter of junior and senior high school Students in Japan reportedly Suffer from insomnia. These preschoolers/pupils/students may be suffering from behaviorally induced insufficient sleep syndrome due to inadequate sleep hygiene. If this diagnosis is correct, they should be free from these complaints after obtaining sufficient sleep by avoiding inadequate sleep hygiene. However, such a therapeutic approach often fails. Although social factors are often involved in these sleep disturbances, a novel clinical notion - asynchronization call further a deeper understanding of the pathophysiology of these disturbances. The essence of asynchronization is a disturbance in various aspects (e.g., Cycle, amplitude, phase and interrelationship) of the biological rhythms that normally exhibit circadian oscillation, presumably involving decreased activity of the serotonergic system. The major trigger of asynchronization is hypothesized to lie a combination of light exposure during the night and a lack of light exposure in the morning, In addition to basic principles of morning light and all avoidance of nocturnal light exposure, presumable potential therapeutic approaches for asynchronization involve both conventional ones (light therapy, medications (hypnotics, antidepressants, melatonin, vitamin B12). physical activation, chronotherapy) and alternative ones (kampo. Pulse therapy, direct contact, control of the autonomic nervous system, respiration (qigong, landen breathing). chewing, crawling). A morning-type behavioral preference is described in several of the traditional textbooks for good health, The author recommends a morning-type behavioral lifestyle as a way to reduce behavioral/emotional problems, and to lessen the likelihood of falling into asynchronization. (C) 2008 Elsevier B.V. All rights reserved.
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