In case of head injury keep the person still
true
If you do not sleep for 40 days it can potentially kill you because if you slept more than 3 days then that will cause more harm then it would’ve been as to sleeping regularly in a daily schedule. That is abnormal and would give you a horrendous amount of hallucinations, basically insomnia from situating from that problem and can also put the higher chance into leaking towards paranoia. It will also lead into sleep deprivation, heart failure, high blood pressure, diabetes and potentially strokes that would consider damaging your health harshly.
I think all of the above, i hope that helps! :))
If you want to serve but don't want to be in combat, sadly your gonna have find another job unless you want to do infantry.