Background 13-21% out of the people exposed to a potentially traumatic event suffer from Acute Stress disorder (ASD; American Psychiatric Association, 2013). Findings show that 70% of the people who are diagnosed with ASD during the first month following the traumatic event go on to develop Post-Traumatic Stress Disorder (PTSD; Harvey & Bryant, 1998). PTSD is characterized by re-experiencing of the traumatic event, avoiding situations that remind the event, hypervigilance, and negative feelings and beliefs about the self.