Six o'clock
Occasionally we might start a little earlier , but not as a habit . I myself was up that morning at five . This was earlier than I had intended . I had said to myself on going to sleep , `` Six o'clock , sharp ! '' There are men I know who can wake themselves at any time to the minute . They say to themselves literally , as they lay their heads upon the pillow , `` Four-thirty , '' `` Four-forty-five , '' or `` Five-fifteen , '' as the case may be ; and as the clock strikes they open their eyes . It is very wonderful this ; the more one dwells upon it , the greater the mystery grows .