0.00   Indirect effect via mediator:                                                                             Sleep difficulties (at T0)                      0.00          0.00   0.00; 0.00                                                                                                                                     *DV: Difficult child*                                                                   0.00           \<0.000                                                                                                             PTS symptoms (at T0)                                                                                      Total effect                                    0.00          0.00                                     \<0.000   Direct effect                                   0.00          0.00                                     \<0.00   Indirect effect via mediator:                                                                             Sleep difficulties (at T0)                      0.00          0.00   0.00; 0.00                                                                                                                                    Regarding parent--child dysfunctional interaction (see Table [0](#T0){ref-type="table"}), the total effect (*c path*) of sleep disturbances on this dimension of parenting stress (Coeff. = 0.00; *p* \< 0.00) was significant. The results also indicated that PTS symptoms had predictive effects on the mediator 