I suffer mainly from the caffine withdrawal. But this is good in a sense. By the end of Ramadan, I typically rid my system of a lot of junk that I'm used to putting into my body. Also, the effects of "performance enhancing" chemicals not being there also means you just have to work harder at what you do. While this may be hard in the beginning, it gets much better as time goes on.
Despite all of this, I know all about Ramadan code. After 5pm my blood sugar drops low enough that I can barely write a line of code without introducing serious bugs or typos. So, I try to get most of the coding done in the morning.
I drink 3 glasses of water in the early AM meal + 1 glass of milk and then 4-6 glasses in the evening. I even fit in a light workout before breaking fast in the evening. So, dehydration isn't too much of a issue (at least if you're working indoors).
Despite all of this, I know all about Ramadan code. After 5pm my blood sugar drops low enough that I can barely write a line of code without introducing serious bugs or typos. So, I try to get most of the coding done in the morning.