Dissociation mental process where a person disconnects from their feelings, thoughts and sense of identity. It's a normal thing that happens to every one commonly known as day dreaming and sometimes it's something we do to focus on certain tasks. This is a way our minds cope with the stresses of life especially those who have been through traumatic events or experiences. It's something that can happen for hours, days, weeks however if it lasts for a longer period of time like months then it becomes a dissociative disorder.