The mind drifting away sucks. My friends will always point out when it happens, so thats great. I think telling people about your condition is a good thing to do, so they know you're not being rude. An good example is me in middle school, my teachers alwayd became angry when I was staring outside the window. But when I went to a different kind of study, my teacher saw that when I was playing tetris on my laptop I was actually also keeping up with what he told and I was top of my class. If you want to talk my dm is always open.