 maternal sleep difficulties mediated the association between PTS symptoms and PD (*r*^0^ = 0.00; *F* = 00.00; *p* \< 0.000; Coeff. = 0.00; 00% CI = \[0.00, 0.00\]) and the coefficient of the *R*-squared mediation effect size was 0.00 (00% CI = 0.00, 0.00).  ######   Sleep difficulties as mediators.                                                    Coefficient   *SE*   Bootstrap 00% CI   Model *R*^0^   (*p*)   ----------------------------------------------- ------------- ------ ------------------ -------------- ---------   *DV: Parental distress*                                                                 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                                                                                                                                     *DV: Parent--child dysfunctional interaction*                                           0.00           \<0.00                                                                                                             PTS symptoms (at T0)                                                                                      Total effect                                    0.00          0.00                                     \<0.00   Direct effect                                   0.00          0.00                                     \