four o'clock
And as he sat there a drowsiness stole over him which he made no effort to resist . In a few minutes the world of sight and sound was blotted out , and he slept . He awakened with a start and looked around . Then he glanced at his watch and found that it was four o'clock , and that he must have been asleep for about half an hour . What was it that aroused him ? he wondered . No one was in sight , and he could hear nothing .