Take a walk.

I've been in front of my screen for around 12 hours since this morning now and it’s not unusual to pull a 15 or 16 hour day on my computer.
My will to make something out of myself, to keep making it happen and to climb to the top obligates me as a computer science fellow to be glued on my computer all day long.
Come to think of it, about 2 years ago I had this terrible headache and my eyes would feel dry when sitting on the computer for more than a few hours (and even then my parents would ask me to shut the computer off).
I finished all my tasks for today, tomorrow is another day with new challenges.
I’m going to do something different, something I’d advise people to do the same to clear their minds (although I barely do): I'm going to take a walk.