Hello , Doctor .   Well , What seems to be the trouble , Mr . Williams ?   It's nothing serious actually , doctor . It ’ s ... Well , I get tired very easily recently , and I often doze off during meetings , office hours and sometimes even while I'm dining .   How long has this been going on ?   About two months . I didn't pay much attention to it in the beginning , but you see , I got fired this morning . I dozed off while we were having an important meeting , right in front of the boss . I was very embarrassed .   How was your appetite ?   Pretty good , I'd say .   You haven't lost any weight , have you ?   No , doctor . I've actually put on two pounds .   Unbutton your shirt , please .   Well , doctor ? 