To identify the trajectories of sleep duration among adults in China, and explore the associatedinfluencingfactors.

Data was derived from 2010-2020 China Family Panel Studies (CFPS). Self-reported measures of night sleep duration were used. People aged ≥18 years were included. LCGM and polynomial Logistic regression model were used.

A total of 10 113 adults were included. Four similar trajectory groups of sleep duration were identified among Chinese adults: severely insufficient sleepduration group (3.12%), insufficient sleepduration group (27.63%), moderate sleepduration group (63.41%) and excessive sleepduration group (5.84%). Polynomial logistic regression showed that, using moderate sleep duration group as the reference, individuals who were older (OR=7.29, 95% CI: 2.23-23.83), lived in urban areas (OR=2.45, 95% CI: 1.89-3.17), had higher levels of depressive symptoms (OR=1.12, 95% CI: 1.09-1.15), and people who drank alcohol (OR=1.60, 95% CI: 1.10-2.32) were more likely to be classified into severely insufficient sleep duration group. Males (OR=0.49, 95% CI: 0.35-0.67), living in western regions (OR=0.42, 95% CI: 0.29-0.61) were less likely to be classified into severely insufficient sleep duration group. Older adults (OR=2.38, 95% CI: 2.01-2.83), those with middle school education (OR=1.16, 95% CI: 1.03-1.30), high school education (OR=1.20, 95% CI: 1.04-1.40), college education and above (OR=1.23, 95% CI: 1.01-1.50), living in urban areas (OR=1.34, 95% CI: 1.21-1.48), having more depressive symptoms (OR=1.03, 95% CI: 1.02-1.04), adults drinking alcohol (OR=1.20, 95% CI: 1.05-1.37), and using Internet (OR=1.20, 95% CI: 1.07-1.34) were more likely to be classified into insufficient sleep duration group. Those with higher economic status (OR=0.84, 95% CI: 0.70-1.00), living in western regions (OR=0.51, 95% CI: 0.45-0.58), self-reported fair health (OR=0.86, 95% CI: 0.75-0.98) and good health (OR=0.83, 95% CI: 0.71-0.97), rated life satisfaction as fair (OR=0.74, 95% CI: 0.57-0.94) and satisfied (OR=0.76, 95% CI: 0.60-0.97) were less likely to be in insufficient sleep duration group. Living in the western regions (OR=1.81, 95% CI: 1.44-2.27) were more likely to be classified into excessive sleepduration group, while those aged 30-44 years (OR=0.64, 95% CI: 0.48-0.84), 45-59 years (OR=0.74, 95% CI: 0.55-0.99), having middle school education (OR=0.75, 95% CI: 0.61-0.94), college education and above (OR=0.25, 95% CI: 0.14-0.46), living in urban areas (OR=0.73, 95% CI: 0.60-0.88) were less likely to classified into excessive sleepduration group.

Four groups of sleep duration trajectories among Chinese adults were identified. Sociodemographic factors, socioeconomic status, physical & mental health, health behavior, and life satisfaction were closely related to the trajectories of sleep duration among Chinese adults.