"I closed my eyes
Drew back the curtain
To see for certain
What I thought I knew
Far, far away
Someone was weeping
But the world was sleeping
Any dream will do"
Well, isolated from the rest of the song, this part works well enough. It would mean that he has been shutting himself off from reality for a long time, but now he realizes that he must face the horror of what's really happening in the world. And so he forces himself to "draw back the curtain" and see. When he does, though, he finds that the "world is sleeping" just as he was, and that nobody is doing anything about the injustice in the world.
Within the song though? Who knows. :-P
Pretty is what changes. What the eye arranges is what is beautiful.