When you sleep your eyes move left and right and physical movement takes trauma and moves it from your frontal lobe to the back of your brain or to another part of the brain where you can store it that memory but when you think about those things that happened, you don't associate the feeling that normally comes with it. So the problem is if you have something traumatic happen and you are not getting a good amount of rest, it will stay in your frontal lobe. - Matty Mullins