Nationwide epidemiological study of insomnia in Japan

• A Japanese nationwide epidemiological study of insomnia with new criteria.• The prevalence of insomnia was 12.2% in men and 14.6% in women.• Insomnia-associated factors (men): unemployment, and poor mental health.• Insomnia-associated factors (women): age, years of schooling, and poor mental health.• There were no significant associations between insomnia and season or region.

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