1) In my opinion I think that older waiter is so slow and unwilling to go to bed because the fact that he suffers from insomnia. I believe that he is (based on what's seen or what seems obvious) holding/hiding/giving shelter to some form of guilt of something that affected him in his earlier years. Weather her he did something, either something bad happened to him andscarred him. This Nada refrain shows the old waiter has had some (having to do with human existence) terribly unfair treatment against him and he no longer believes in god. The waiter is understanding of the old man's need for visiting the cafe on the basis of loneliness. They both of them appear to be lonely and don't want to be by themselves, especially the suicidal old man.
