In one study of 105 Vietnam War veterans with chronic PTSD,the subjects were asked to keep a sleep diary over the course of six weeks.According to your text,the researchers found that shorter duration of sleep was correlated with

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The study found that shorter duration of sleep was correlated with severity of PTSD. This suggests that the more severe the PTSD symptoms, the more likely the individual is to experience sleep difficulties. The other options mentioned (length of service in Vietnam, degree of post-service adjustment, and depth of co-morbid depression) were not found to be correlated with sleep duration in this particular study.

In One Study of 105 Vietnam War Veterans with Chronic