Background

The predictive effects of change patterns of sleep problems on mental health after a long-term disaster remain poorly known. We examined the change patterns of sleep problems after the Wenchuan earthquake, and tested whether specific sleep-related change patterns could predict mental health problems (posttraumatic stress disorder [PTSD], anxiety, and depression) in the 10 years after Wenchuan earthquake.

Methods

1357 adolescents exposed to the Wenchuan earthquake were surveyed on potential sleep problems at 18 months (T_18m) and 30 months (T_30m) post-earthquake. Among them, 799 participants completed the followed-up survey online 10 years after the earthquake (T_10y). Since some participants did not provide sleep problems data at both T_18m and T_30m, 707 samples were included in final analyses. Linear regression analysis was performed.

Results

Four different patterns of sleep problems were identified: stable-low pattern (61.1%), stable-high pattern (15.3%), decreasing pattern (13.2%), and increasing pattern (10.5%). Additionally, we found that individuals in stable-high and increasing patterns were more likely to experience PTSD, anxiety, and depression at T_10y in the crude model. After controlling for confounders (e.g., earthquake exposure), these patterns were strongly predictive of depression at T_10y.

Limitations

Only two waves of sleep problems were collected and subjective sleep outcomes methods were used to collect data instead of objective methods.

Conclusions

Sleep problems had heterogeneity after a deadly earthquake. Individuals in stable-high and increasing patterns should be given more attention. Timely assessment and targeted interventions on specific sleep problems are necessary for preventing an escalation of adverse mental health outcomes.