biostudies-literatureMorita EGrants-in-Aid for Scientific Research for Priority Areas of CancerAMEDGrants-in-Aid for Scientific Research for Innovative AreasThe Japan Society for the Promotion of Science (JSPS) KAKENHI Grants from the Ministry of Education, Culture, Sports, Science and Technology1338https://www.ebi.ac.uk/biostudies/studies/S-EPMC12469467biostudies-literatureUnknown22(9)This study aimed to provide basic data according to age on objective sleep duration distribution and sleep characteristics via subjectivity, and to determine the prevalence of insufficient sleep and related sleep parameters in the general Japanese population. Data from the second survey of the Japan Multi-Institutional Cohort (J-MICC) Daiko Study were used for the analysis, with 2091 participants (1556 women; 58.6 ± 9.8 years old) included. Questionnaires included subjective sleep duration, perceived sufficiency, regularity, the Pittsburgh Sleep Quality Index (PSQI), Insomnia Severity Index (ISI), Morningness-Eveningness Questionnaire (MEQ), and Epworth Sleepiness Scale (ESS). Sleep measurements were taken via actigraphy for one week. In total, 247 (11.8%) respondents reported insufficientInternational journal of environmental research and public healthSleep Characteristics and Prevalence of Perceived Insufficient Sleep Across Age Groups in the Japanese Community-Based General Population: The Japan Multi-Institutional Collaborative Cohort Daiko Study.PMC1246946726507005, 16H06277, 21H02246, 22H04923, 23K21219No. 17015018221S0001JP21zf0127005Mitsuda YWakai KKadotani HYamada NTamura TMorita EfalseSleep Characteristics and Prevalence of Perceived Insufficient Sleep Across Age Groups in the Japanese Community-Based General Population: The Japan Multi-Institutional Collaborative Cohort Daiko Study.This study aimed to provide basic data according to age on objective sleep duration distribution and sleep characteristics via subjectivity, and to determine the prevalence of insufficient sleep and related sleep parameters in the general Japanese population. Data from the second survey of the Japan Multi-Institutional Cohort (J-MICC) Daiko Study were used for the analysis, with 2091 participants (1556 women; 58.6 ± 9.8 years old) included. Questionnaires included subjective sleep duration, perceived sufficiency, regularity, the Pittsburgh Sleep Quality Index (PSQI), Insomnia Severity Index (ISI), Morningness-Eveningness Questionnaire (MEQ), and Epworth Sleepiness Scale (ESS). Sleep measurements were taken via actigraphy for one week. In total, 247 (11.8%) respondents reported insufficient2025-01-01T00:00:00Z2025 Aug2026-05-02T03:19:44.162Z2026-05-02T03:11:46.631ZS-EPMC124694674100748210.3390/ijerph22091338