I agree _Sky. There are many, many reasons for it.
My T was explaining to me how I tend to get more accident prone when my PTSD is heightened and that I need to slow down and try to concentrate so I don't hurt myself.
Somehow I never remember that till it's too late.

Common“symptoms”
after exposure to trauma or loss.
•Physical: fatigue, appetite change,
sleep loss, tension, being more
accident prone.
•Cognitive: “spacing out,”decreased
ability to focus or concentrate,
forgetfulness.
•Emotional: frustration, anxiety,
depression, mood swings, nightmares.
•Social: isolation from others,
intolerance, lashing out, distrust,
lowered sex drive.
•Spiritual: emptiness, loss of direction,
doubt, apathy.
http://www.neahin.org/resources/docs...e-Brochure.pdf