midnight
`` Not for some time yet . '' `` But , if you intend to watch until daylight , you will be worn out by morning . Besides , you can not stay awake unless you move about . I will agree to lie down if you will promise to call me when you think it is midnight , and let me take a turn . '' `` I will agree to call you when I feel the need of you , and I will pace the ground like a sentinel on duty . '' The mother was forced to accept this proposition and , after some more cautious conversation , she did as her boy wished , and he was left alone . Ben did not forget his slip of the night before .