The first time I stumbled upon HN I then couldn't return for years - the idea of how much cool stuff (I necessarily want to learn) is on every page here would give me panic. I preferred to pretend I never seen this and kill the thought every time HN would pop up in my mind because I would have no time to sleep, eat, work or whatever otherwise. It took me some years and I learnt to manage with this obsession but it pretty much explains why would I need systematized notes - I obviously couldn't just remember everything.