关于海明威作品A Clean,Well-Lighted Place的问题,

关于海明威作品A Clean,Well-Lighted Place的问题,
question：what besides insomnia makes the older waiter reluctant to go to bed?comment especially on his meditation with its nada refrain.why does he so well understand the old man's need for a cafe?what does the cafe represent for the two of them?
随便答一两句就好了，考试时的提问回答，并非essay question，个人见解或官方答案均可（反正写了老师都会给点分的）。