I don't have the statistics but I do remember a nurse telling me that working shift work which often results in loss of sleep due to changing sleep patterns will effect the speed at which one can retrieve information from memory.
I had the answer to this but I was up late last night and can't seem to remember now... I'll let you know if it comes back to me.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.