The prevalence of probable delayed-sleep-phase syndrome in students from junior high school to university in Tottori, Japan

The Tohoku Journal of Experimental Medicine
Gen-i HazamaKazuyuki Nakagome

Abstract

Delayed sleep phase syndrome (DSPS) is a circadian rhythm sleep disorder with a typical onset in the second decade of life. DSPS is characterized by the sleep-onset insomnia and the difficulty in waking at the desired time in the morning. Although DSPS is associated with inability to attend school, the prevalence has been controversial. To elucidate a change in the prevalence of DSPS among young population, epidemiological survey was conducted on Japanese students. A total of 4,971 students of junior high school, senior high school, and university were enrolled in this cross sectional study in Tottori Prefecture. They answered anonymous screening questionnaire regarding school schedule, sleep hygiene and symptomatic items of sleep disorders. The prevalence of probable DSPS was estimated at 0.48% among the total subject students without gender difference. In university, the prevalence of the last year students showed the highest value (1.66%), while that of the first year students showed the lowest value (0.09%) among all school years from junior high school to university. The prevalence increased with advancing university school years. Thus, a considerable number of Japanese students are affected with DSPS. Senior students of u...Continue Reading

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Citations

Jul 3, 2010·The Tohoku Journal of Experimental Medicine·Shoichi AsaokaKatuo Yamazaki
Sep 3, 2013·Journal of Clinical Sleep Medicine : JCSM : Official Publication of the American Academy of Sleep Medicine·Nicole LovatoGorica Micic
Dec 14, 2011·Sleep Medicine·Ingvild W SaxvigBjørn Bjorvatn
Dec 4, 2014·International Journal of Adolescent Medicine and Health·Md Dilshad ManzarM Ejaz Hussain
Jan 3, 2012·Journal of Attention Disorders·Denise BijlengaJ J Sandra Kooij
Oct 15, 2013·Expert Review of Neurotherapeutics·J J Sandra Kooij, Denise Bijlenga
Aug 23, 2020·International Journal of Environmental Research and Public Health·Yan LuoJing Wang

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