midnight
I told myself again and again that I was foolish to think about something that could n't be helped . Why not forget it , and go to sleep ? But somehow I could n't . I lay wide awake till long past midnight , finding myself growing more and more nervous . At last , such was the tension of it all , I got up and dressed . It was then about one-thirty , and I stepped out on the street for a walk . Half an hour later I returned , my lungs full of fresh air , hoping that I could now sleep .