IMPORTANCE The association between long sleep duration and mortality appears stronger in EastAsian populations than in North American or European populations.OBJECTIVES To assess the sex-specific association between sleep duration and all-cause and majorcause mortality in a pooled longitudinal cohort and to stratify the association by age and body mass index. DESIGN, SETTING, AND PARTICIPANTS This cohort study of individual-level data from 9 cohortsin the Asia Cohort Consortium was performed from January 1, 1984, to December 31, 2002. The final population included participants from Japan, China, Singapore, and Korea. Mean (SD) follow-up time was 14.0 (5.0) years for men and 13.4 (5.3) years for women. Data analysis was performed from

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