about two o'clock
At ten o'clock last night , I relieved Carragher as special guard over No. 9764 . Carragher reported that the prisoner was somewhat restless and had n't been asleep as yet . I sat down about fifteen feet from his bed and prepared to keep an eye on him until I was relieved at six o'clock this morning . `` Nothing happened until about two o'clock . No. 9764 was restless as Carragher had said , but toward midnight he quieted down and apparently went to sleep . I was sleepy myself , and I got up and took a turn around the room every five minutes to be sure that I kept awake . That 's how I am so sure of the time , sir . ''