Hello! Dreaming about one's fears is normal following trauma; it is a type of re-living phenomenon, just as having flashbacks and intrusive thoughts during the day are. The brain is attempting to make sense of the fragmented elements of memory of the trauma. Trying to avoid thinking about the trauma during the day means the memory fails to get processed and PTSD persist. If your friend is able to access Trauma-Focussed Cognitive Behavioural Therapy or EMDR (Eye Movement Desensitisation Reprocessing) they will learn how to integrate the fragments of memory in a safe environment with the assistance of anxiety management techniques in order to bring to an end the distressing reliving phenomena.