midnight
`` No , please , I 'd rather go alone , '' said Betty firmly . `` It 's a test , you see , and the idea is n't to make it easy . I 'll be all right , and in the morning the girls will find the card and know I did n't flunk . '' After the girls had gone away to their own rooms the clock was set for a quarter of twelve , but Betty and Bobby decided that they might as well stay awake till midnight . They would lie down on their beds -- Betty insisted that Bobby should undress and go to bed `` right '' -- and wait for the time to come . Within twenty minutes they were both sound asleep . The muffled whir of her alarm clock awakened Betty .