midnight
he demanded . `` Socks ! Bushels of socks , mostly , '' answered Lydia with a chuckle that ended in a groan . She looked at Billy whimsically and then as the sureness of his understanding came to her again , she told him the story of her little midnight sweatshop . `` Oh , dearest ! '' Billy burst forth with a groan when she had finished , `` how could you be such a little idiot ! Oh , Lydia , Lydia , I ca n't tell you how you wring my heart . ''