about midnight
`` I do n't know , '' said the American , with a curious smile about the corners of his lips and a twinkle in his eye . `` I do n't think he was quite square in the night . '' `` Why not ? '' `` Well , you see , he had to rouse me up to relieve him about midnight , when I was in such a beautiful sleep that it was a sin to break it , and what does he do but snap it in two about an hour before he ought . '' `` I do n't believe he would , '' cried Chris . `` No , you do n't , because he 's your father . He ai n't my father , and so I believe he did . ''