Insomnia is a main precursor to depression; However, the potential for treatment of insomnia is preventing depression is not sufficiently scrutinised between Jordanian patients. Therefore, in this experiment, an investigation of the impact of a cognitive-behavioural therapy program to reduce insomnia on depressed patients in Jordan. The study adopted an experimental design. 17 patients were purposely chosen to join the experiment. The two experimental groups were subjected to the Beck test for depression and the dependence scale. The treatment consisted of 14 treatment sessions of 45 minutes per session. The data was analysed descriptively and inferentially using SPSS 23.0 software. The findings showed that the therapeutic program used is effective in reducing the degrees of depression among depressed and insomnia patients. MANOVA analyses revealed there are statistically significant differences on the two scales in the scores. The level of significance was (0.000), which is less than (α ≤ 0.05) for the independent variable. The explained variance was calculated: (eta squared x 100%): 0.301 X 100% = 30%, meaning that the treatment explained (30%) of the variance in the dependent variable with respect to depression, while the explained variance was calculated for insomnia: (eta squared x 100%): 0.75 x 100% = 75%, meaning that the treatment explained (75%) of the variation in the dependent variable for insomnia. The study recommends conducting further investigation on group therapy modalities of reducing insomnia before making recommendations.