In agricultural tractors for example, as a general rule 40 to 50 percent of the value of the machine will be lost in the first quarter of the machine's life and by the halfway point of lifetime, from 70 to 75 percent of the value will be lost.
People with PTSD may feel constantly alert after the traumatic event. This is known as increased emotional arousal, and it can cause difficulty sleeping, outbursts of anger or irritability, and difficulty concentrating. They may find that they are constantly on guard and on the lookout for signs of danger.
1 They may use drugs or alcohol. 2  Some people with PTSD use drugs or alcohol to help them cope with their symptoms. 3  In fact, using too much alcohol can get in the way of restful sleep. 4  Alcohol changes the quality of your sleep and makes it less refreshing. 5  This is true of many drugs as well.