This is the problem.
Yes I dozed off in lectures too but only when I knew the material already (preparation - another modern day student failing!) or had a heavy night or a starchy breakfast.
Like I said I'm fairly experienced with LaTeX. I've used it for technical documentation for 20 years.
Picking an example, I did an EE degree. I sat there and watched a hundred students scribbling out a lecturer's slide with basic function laplace transforms in it. The lecturer moved on leaving 99 people with half a table of transforms. Me, I'm sitting there with <<laplace basic transform table>>. I took this home, reviewed notes and added a reference to my textbook which contained it, added a sticky note to the book page sticking out of the side. Then I spent some time playing with them and trying them out and building valuable real understanding.
Now I've completely forgotten what you even use a laplace transform for 20 years later but I can find out in 10 minutes with that textbook and my notes which I still have in a concise manor.