2011-4-6 It is doctor Chen who is on duty today. And it also his first day on duty. But he is different from me, since he had been working in junior hospital for about 8 years when he came to this hospital. He asked me whether he could go to sleep after 8. I replied that he can go to sleep whenever he want to, but the same he be awakened by patient or nurse. Things seems to go smoothly this night, so I should go to sleep too. Doctor Chen has not been awakened by anybody yet, at the time of 23:18.