Topper,
I have the same problem, I have difficulty sleepy,, extreme difficulty and do not concentrate well, I take an add med and a med to aid sleep,, it's all related,, the fact that you do not sleep well has everyhing to do with why you feel tired and do not concentrate well, you feel tired because you do not sleep well,, and you do not concentrate well or concentrate like you would like to because you do not rest your brain enough
write me back I am not trying to be a know it all just giving my opinion
thanks topper for posting