Rebbe Nachman teaches: Chatzot [i.e., the practice of rising at midnight to lament the destruction of the Temple] has the power of redemption. It can sweeten harsh decrees (Likutey Moharan I, 149).
At the time of Chatzot, great Lovingkindness descends from Heaven (Likutey Halakhot, Hashkamat HaBoker 1:14).
Just as the Exodus from Egypt began at chatzot, so too, the Final Redemption will take place at chatzot. This teaches us that the redemption we await will come due to the merit of those who rise for Chatzot (ibid., 1:15).