To examine the association between sleep quality and psychological resilience in a Chinese community-based cohort and assess the consistency of this association across two sleep measures.

Cross-sectional analysis of baseline data.

Community-based cohort in Hangzhou, China (2016–2019).

10 268 adults aged 18–80 years enrolled via quota sampling stratified by sex and age group. After excluding participants with missing data, analytic samples were 9781 (single-item measure) and 9780 (Pittsburgh Sleep Quality Index (PSQI)), owing to one additional missing response.

Low psychological resilience, defined by a median split on a 9-item scale adapted from the Brief Resilience Scale and Connor–Davidson Resilience Scale.

Poor sleep quality was associated with higher odds of low resilience across both measures (single-item measure, adjusted OR=1.5, 95% CI 1.3 to 1.6; PSQI, adjusted OR=1.5, 95% CI 1.4 to 1.7), after adjustment for demographic factors, socio-economic factors, mental health indicators and health behaviours. Interaction tests showed no evidence of effect modification by sex, age group, loneliness or depression history for the single-item measure (p>0.05). For the PSQI, the association differed by loneliness (p<0.05), with a larger magnitude of association among lonely participants (adjusted OR=2.1, 95% CI 1.6 to 2.7) than non-lonely participants (adjusted OR=1.5, 95% CI 1.3 to 1.6).

Poor sleep quality was consistently associated with low resilience across both measures. Because the design was cross-sectional, temporal direction cannot be established. Longitudinal and interventional studies are needed to establish temporal ordering, and intervention studies are needed to determine whether improving sleep increases resilience.