ten o'clock
So he brought up from the beach an ample supply of drift-wood , and laid it with the rest . When Tom 's work was ended , it was late in the day , and he determined to secure some sleep before he began his long night 's work . He knew that he could waken at the right time ; so he laid himself down in his tent , and soon slept the sleep of the weary . By ten o'clock he was awake . He found the water already up to the boat . There was no time to lose . He carried his box of biscuit on board , and filled his pan with water from the brook , so as to secure himself against thirst in case the boat should float away farther than he anticipated .