one o'clock
When two had toiled for an hour or more , they gave way to the other couple , and the progress thus continued without interruption , while the time slowly dragged along . The resting spells gave each the opportunity for sleep , thus husbanding their vigor for the morrow . Finding that there was nothing to which he could turn his hand , the physician reclined at the bow and soon joined the others in dreamland . It was probably one o'clock when Jack Everson , who had been sleeping for nearly an hour , was awakened by a gentle shaking of his shoulder . Opening his eyes and looking up he saw Wharton bending over him . `` All right , '' remarked the American ; `` I 'm ready for my turn , '' and he rose , yawning , to his feet . `` I think we had better rest until morning . ''