title: Sleep loss and daytime sleepiness in the general adult population of Japan.
abstract: There are few epidemiological studies on sleep loss and daytime sleepiness in the general adult population of Japan. A total of 4000 adult people, aged 20 and over, were randomly drawn from five areas of Japan, and 3030 individuals were interviewed and completed a questionnaire including information about sleep duration and sleep problems. Overall, 29% slept less than 6 h at night, 23% reported having insufficient sleep, and 6% took sleep enhancing medications. The prevalence rates were 21% for symptoms of insomnia and 15% for excessive daytime sleepiness. Symptoms of insomnia were more prevalent in the elderly, whereas young people were more likely to report short sleep duration, subjective insufficient sleep and excessive daytime sleepiness. A multiple logistic regression model revealed that excessive daytime sleepiness had significant associations with young people, short sleep duration, insomnia symptoms, subjective insufficient sleep and sleep enhancing medication use. Short sleep duration was the strongest predictor of excessive daytime sleepiness. The findings indicate that sleep loss and excessive daytime sleepiness in the Japanese adult population are common, and comparable to those reported in Western countries. Excessive daytime sleepiness in the general adult population seems more likely to be attributed to short sleep duration.
authors.affiliation: Department of Psychophysiology, National Institute of Mental Health, NCNP, 1-7-3 Kohnodai, Ichikawa, Japan.
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: M
authors.initials: M
authors.lastname: Uchiyama
authors.forename: K
authors.initials: K
authors.lastname: Kim
authors.forename: M
authors.initials: M
authors.lastname: Okawa
authors.forename: K
authors.initials: K
authors.lastname: Shibui
authors.forename: Y
authors.initials: Y
authors.lastname: Kudo
authors.forename: Y
authors.initials: Y
authors.lastname: Doi
authors.forename: M
authors.initials: M
authors.lastname: Minowa
authors.forename: R
authors.initials: R
authors.lastname: Ogihara
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D015897:Comorbidity; D005260:Female; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D011159:Population Surveillance; D015995:Prevalence; D012494:Sampling Studies; D012651:Self Medication / Q000706:statistics & numerical data; D017678:Sex Distribution; D012892:Sleep Deprivation / Q000453:epidemiology* / Q000523:psychology*; D007319:Sleep Initiation and Maintenance Disorders / Q000188:drug therapy / Q000453:epidemiology* / Q000523:psychology*; D011795:Surveys and Questionnaires