Inconclusive evidence for causal effects between rumination and sleep problems: a simulated reanalysis and comment on Yang and Lei (2025)

The divergent findings indicated that it is premature to assume causal effects between rumination and sleep problems and the suggestions by Yang and Lei in this regard can be challenged. It is important for researchers to be aware that correlations, including adjusted cross-lagged effects, do not prove causality in order not to overinterpret findings, something that appears to have happened to Yang and Lei. We recommend researchers to triangulate by fitting complementary models to their data in order to evaluate if analyzed data could be used to support contradicting conclusions, in which case the data should not be used to support any of those conclusions.