one o'clock
Jack instantly answered the guarded hail , and the next minute the two came together . `` How is it you are awake ? '' was the first question of Jack . `` Because it is _ time _ for me to awake ; it was agreed that I should go on duty at a little after twelve , and it must be near one o'clock . '' `` But what awoke you ? '' `` Nonsense ! Have n't you and I travelled together long enough to know that when you go to sleep with your mind fixed on a certain time to awake you are sure not to miss it by more than a few minutes ? ''