I remember taking the survey and have seen the presentation put together based on the results of the follow up survey in 2014. TLDR: Overwork and shift work lead to lack of sleep. The new data used manned platforms as control variables and discovered that flying RPAs for the Air Force tends to result in declining physical and mental health, obesity, sleep deprivation, binge drinking, reliance on absurd amounts of caffeine to get through the work day (5+ energy drinks daily), reliance on OTC sleep aids, divorce, low morale, and depression. However, PTSD remains rare.