Hi,
I'm glad EMDR helped you. Generally if youbelive something does you good and makes you happier, it is good to have it!
The problem is that REM: rapid eye movement is observed, but not yet understood! REM is simply an indication that some external or internal disturbance intruded into the sleep and the subconscious created the dreams to respond to it. Rapid eye movement is actually watching a dream unfolding in very fast time.
In the case of post traumatic stress disorder, the thoughts of the cause and the memory of it intruded into sleep and the subconscious responded by creating a dream to divert the attention from it. It is actually the subconscious and the dream it creates that helps the healing.
It is a slow process and opening up about it is always helpful.