Update, it’s been about 3 months now of taking modafinil daily. I did take a week or so break around the 4th of July; because it definitely induced a sleep deficit in me that creeps up and impairs cognitive performance. Upping the dose helps but also clearly exacerbates the problem and is both counterproductive and unhealthy for multiple reasons.
All in all though I have found it to be pretty amazing. I am taking it almost daily now with short breaks when I start to feel like I need it. It has been nothing but positive for me wrt to increasing cognitive performance and productivity. I’m almost 40 now, and I can’t help but to wonder if it is fixing some sort of underlying early age related cognitive deficit(s). I didn’t used to need something, or at least feel like I needed it, to get through hard periods of work.