I know this is going to sound like a very, very, odd and bizarre question, but it's something I've always had happen to me.

I started coding for fun as a kid in middle school and am going to college for it now. Yet ever since I started coding back then, whenever I sit down and code for any somewhat-extended periods of time (even just like 15 minutes) I always find my head getting really foggy and hard to focus. I can still function mostly fine, but I feel very foggy in an experience I can only describe as akin to feeling light-headed.

This still happens to me to this day whenever I code and has been happening for years. Oddly enough, it doesn't seem to come from when I am just using the computer for long periods of time (like surfing the Internet or playing computer games doesn't cause it). Only when coding.

Again, I understand this is super bizarre and must sound really, really, weird to most people but has anyone else experienced this?