The Room for Rectifying Souls:
Pirush Arbah Anfei Hakodesh on the Hagadah Shel Pesach (Chelek Hasipurim, Ois 4) quotes Rav Mottele’s son, the Magid of Trisk zy”a, as relating that his father’s room was known both as “the Tikkun Neshamos Room”, because every night at midnight, his father would come to this room to make tikkunim for the souls of the dead.
He related that when he was a young boy, he and his brother, Rav Dovid’l of Tolna zy”a, would sleep in one bed in this room. When they would see their father entering the room, they would cover their heads with the blanket so as not to see what he was doing. They once took the blanket off their heads and saw their father granting a tikkun to a neshama. Rav Dovid got so scared that he became sick and remained sickly for the rest of his life. The Magid of Trisk, however, was not scared.
