Midnight journey there and back again

Midnight. Silence. Everybody sleeps. Except you. You are on the way to the bathroom and your mission is getting there waking nobody. But the point is that the more you try to walk quietly the more noise there is in fact.

This is all correct! To make it sound a little more natural I might say:

Midnight. Silence. Everybody sleeps. Except you. You are on the way to the bathroom and your mission is to get there without waking anybody. But the point is that the more you try to walk quietly the more noise you make.

But the way you wrote it is right too.