I have had seen some amazing "breakthroughs" in session or reported shortly after. One of the most memorable and frightening was former Marine that suffered from PTSD. His wife, who was part of the session, wrote me later to say his personality had undergone a marked change for the better. He was sleeping, able to concentrate and was simply a nicer person to deal with. The mind is a wondrous and mysterious thing - and so is BDSM.